Ostrich Eggshell Research Articles

Ostrich eggshell beads: Hole drilling technology at Little Muck Shelter, South Africa

Ostrich eggshell beads (OES) are commonly found in forager sites across sub-Saharan Africa. Although they have received a reasonable amount of investigation, the drilling technology used to perforate OES beads has received little attention. As a result, not much is known about this technology. Providing a basic tool form for these drills could be useful for future researchers to identify such tools in assemblages, or to prompt revisiting older assemblages to identify these types of tools, which might have been overlooked or misidentified. This study made use of experimentation and use-wear to determine the types and shapes of materials most effective for perforating OES. It was determined that early foragers most likely used micro-lithic drills made from small, but thick, flake blanks that were retouched along the laterals to create a near symmetrical point with a tetrahedral tip. At Little Muck Shelter the base of the flake was also shaped to resemble a tang that likely aided hafting. This tool form can act as a basis to help researchers identify similar technology which can be studied and help broaden our understanding of the complexity of forager technology.

Ostrich eggshell bead-making in East Africa: a study of crafting in the El Molo community, Kenya

ABSTRACT Ostrich eggshell beads have been produced by African societies for over 50,000 years and are still used in East Africa and elsewhere, yet the only well-documented ethnographic record of their manufacture comes from San and Bakgalagadi communities in the Kalahari region of southern Africa. Even so, some aspects of their social significance have not been extensively explored. In particular, research on ostrich eggshell beads in southern Africa has historically focused largely on the use of beads in exchange contexts with less emphasis on their use in bodily adornment or the social contexts of manufacture and consumption. This paper reports on the production process and cultural significance of ostrich eggshell beads among the El Molo community of Marsabit County, Kenya. Undertaken as part of the British Museum’s Endangered Materials Knowledge Program (EMKP), this project used unstructured interviews, participatory videos, photography and note-taking to document the entire process of ostrich eggshell bead manufacture, including the collection of hammer stones (soit), the making of strings (arkat) for stringing the beads, the breaking of shells, shaping and rounding, stringing and the making of diverse beadwork items, including rumirumi, kukuti, karkato, lilim and rarak. The social significance of these various items is also reported. This study helps to preserve this knowledge and the continuation of the craft in the community, while also providing data for the enrichment of interpretations of ostrich eggshell beads from archaeological collections in the region, which have received inadequate research attention. The project represents the first detailed ethnographic work ever undertaken on ostrich eggshell beads in East Africa. The materials produced will be available on the EMKP open access online repository.

Making connections: ostrich eggshell beads as indicators of precolonial societal interaction in southeastern southern Africa

ABSTRACT Ostriches are peculiar birds and their strangeness has been recognised by southern African hunter-gatherers through multiple symbolic associations. Such qualities are likely to have been enhanced where people had access to beads made from their eggshell but did not have direct knowledge of the birds themselves. Southeastern southern Africa, encompassing the Maloti-Drakensberg Mountains, the eastern half of the Eastern Cape Province and much of KwaZulu-Natal is one such area. We review the unusual attributes and associations of ostriches and their eggshell before briefly summarising previous work that has used strontium isotope analysis to investigate past bead exchange networks in this region. Because bead size can be controlled and patently varies through time and space, we then employ it as another potential indicator of the existence and spatial extent of past social networks. Having critically considered previous efforts in this field, we report on our work to build the largest sample of such data yet obtained in southern Africa and compare our preliminary results with other signals of interaction between precolonial hunter-gatherer and (where applicable) agropastoralist communities.

Emergence of fibrecraft specialization 8000 years ago in early Neolithic North China

Fiber technology, crucial to human societies for millennia, encompasses cordage and textiles. The development of fiber crops and the production of fiber-based clothing are significant components of the Neolithic Revolution. Despite China being an independent center for agriculture, the role of fiber technology in this context remains largely unexplored. In this project, we employed a comprehensive approach that combines microfossil analysis and use-wear examinations to study tools from the Peiligang site in North China. This site uniquely spans the Upper Paleolithic and early Neolithic periods, offering an ideal setting for investigating the evolution of fiber production. Our results reveal that some Paleolithic blades and scrapers were associated with fiber production, which coincided with ostrich eggshell beads and hematite during the cold and dry Last Glacial Maximum period. Responding to climatic fluctuations, fiber production played a significant role in subsistence and ritual activities. In the early Neolithic, advanced fiber production is evident. Two adjacent burials yield tools and microfossil remains representing a toolkit for fiber and possible textile production, including harvesting, retting, pounding, scraping, and sewing. Fibers recovered from human bones provide potential evidence of textile production and use. Dyeing with blue, black, and red colorants was common for textiles, cordages, and strings. These grave goods suggest the involvement of the deceased in craft production with bast fibers, possibly embodying the earliest specialization in fiber craft 8000 years ago in Neolithic China.

Osteoproductivity of Injectable Bone Grafts with and without Ostrich Eggshell Membrane Protein in Rabbit Femur.

The aim of this study was to evaluate the biocompatibility and effectiveness in terms of osseointegration of dental implants composed of novel injectable bone grafts with and without ostrich eggshell particles and membrane protein in rabbit femur. Sixteen adult male New Zealand rabbits were used in this study. A bone defect was created in each animal's right and left femur, and a dental implant was placed adjacent to the defect. Two graft materials were prepared, one containing the membrane protein and the other not. In two groups, the defects were filled with these materials. In the negative control group (NC, (n:8)), the defects were left empty. A commercial product of biphasic calcium sulfate was used as a positive control material (PC, n = 8). The graft groups were defined as the group with the membrane protein (MP+, (n:8)), and without the membrane protein (MP-, n:8). The animals were euthanized at the 12th week after surgery. The samples were investigated using histology, histomorphometry, and micro-computed tomography. Data were statistically analyzed using one-way ANOVA and Tukey's tests (p = 0.05). Both the PC and MP+ groups had similar newly formed bone areas, and the mean values of these groups were significantly (p < 0.05) higher than those of the MP- and NC groups. The PC group had the highest amount of unresorbed material, while the MP- group had the lowest amount of unresorbed material. The bone-implant contact (BIC) scores of the PC and MP+ groups were significantly higher (p < 0.05) than that of the NC group. The connective tissue area of the PC group was the lowest, which was significantly lower than the other groups (p < 0.05). The grafts produced are highly biocompatible and also showed osteoproductivity. Their cost-effectiveness and osteoproductive activity require further investigation.

Ostrich eggshell beads from Little Muck Shelter, southern Africa: First impressions and regional perspectives

Hunting and gathering communities in southern Africa produced ostrich eggshell (OES) beads for personal ornamentation, trade and exchange, and various forms of symbolism. OES beads convey information related to not only technological processes, but also social histories, making them useful tools for investigating these processes in the archaeological record. In the middle Limpopo Valley, hunter-gatherers produced beads from periods that predated the arrival of farmer societies, before ca. AD 150, until the decline of the Mapungubwe capital, AD 1300. Their analysis may therefore lead to insights into local economies, craft activities, trade and exchange, and social roles. However, no study in the middle Limpopo Valley has sufficiently investigated these beads and their status within forager society. In this paper we study the manufacture of OES beads from one of the excavated forager-occupied shelters in the valley, Little Muck. This study is the first of its kind from a hunter-gatherer context in the region. It shows that Little Muck’s beads were standardised but produced in varying frequencies across temporal periods, and made following different production strategies. Use-wear analysis hints that some of the beads were pigmented and possibly altered using heat treatment. As an initial foray into a forager bead assemblage of the region, this study demonstrates the value such an approach may yield, and it aids in guiding future attempts. It also compares Little Muck’s bead assemblage with those from other sites across a much wider region where such studies have taken place. The findings demonstrate similar patterns to other parts of southern and eastern Africa, but also illustrate local shifts in bead production that follow changes in local socio-political dynamics.

Adaptive foraging behaviours in the Horn of Africa during Toba supereruption.

Although modern humans left Africa multiple times over 100,000 years ago, those broadly ancestral to non-Africans dispersed less than 100,000 years ago1. Most models hold that these events occurred through green corridors created during humid periods because arid intervals constrained population movements2. Here we report an archaeological site-Shinfa-Metema 1, in the lowlands of northwest Ethiopia, with Youngest Toba Tuff cryptotephra dated to around 74,000 years ago-that provides early and rare evidence of intensive riverine-based foraging aided by the likely adoption of the bow and arrow. The diet included a wide range of terrestrial and aquatic animals. Stable oxygen isotopes from fossil mammal teeth and ostrich eggshell show that the site was occupied during a period of high seasonal aridity. The unusual abundance of fish suggests that capture occurred in the ever smaller and shallower waterholes of a seasonal river during a long dry season, revealing flexible adaptations to challenging climatic conditions during the Middle Stone Age. Adaptive foraging along dry-season waterholes would have transformed seasonal rivers into 'blue highway' corridors, potentially facilitating an out-of-Africa dispersal and suggesting that the event was not restricted to times of humid climates. The behavioural flexibility required to survive seasonally arid conditions in general, and the apparent short-term effects of the Toba supereruption in particular were probably key to the most recent dispersal and subsequent worldwide expansion of modern humans.

Trace element concentrations as proxies for diagenetic alteration in the African archaeofaunal record: Implications for isotope analysis

Isotope ratio analyses of trace elements are applied to tooth enamel, ostrich eggshell, and other archaeological hard tissues to infer mobility and other aspects of hominin and animal paleoecology. It has been assumed that these highly mineralized tissues are resistant to diagenetic alteration, but this is seldom tested and some studies document diagenetic alteration over brief time spans. Here, we build on existing research on Maximum Threshold Concentrations (MTCs) to develop screening tools for diagenesis that can inform heavy isotopic analyses. The premise of the MTC approach is that archaeological tissues are likely contaminated and unsuitable for isotope ratio analysis when they exceed characteristic modern concentration ranges of trace elements. Furthermore, we propose a new metric called the Maximum Threshold Ratio (MTR) of 85Rb/88Sr or whole element Rb/Sr, which can be measured simultaneously with 87Sr/86Sr during laser ablation (LA) MC-ICP-MS or applied during post hoc screening of specimens. We analyzed 56 enamel samples from modern Kenyan mammals and 34 modern ostrich eggshells from South Africa, Namibia, and the United States by solution ICP-MS, as well as a subset of shells using LA-MC-ICP-MS. Our results indicate that thresholds are consistent across taxa at a single location, but likely vary across locations. Therefore, MTCs and MTRs need to be tissue and locality specific, but not necessarily taxon-specific. Other important differences are observed between the inner and outer surfaces of the eggshells and between LA and solution ICP-MS. This exploratory study provides guidelines for building reference thresholds to screen enamel and eggshell for diagenesis potentially impacting biogenic isotope ratios.

In-vitro Detection of Intramammary-like Macrocalcifications Using Susceptibility-weighted MR Imaging Techniques at 1.5T.

The aim of our study was to investigate the technical accuracy of susceptibility-weighted imaging (SWI) and quantitative susceptibility mapping (QSM) created to detect intramammary-like calcifications depending on different TEs, volume, and type of calcification samples at 1.5T. Jello-embedded particles of blackboard chalk and ostrich eggshell ranging in size from 4 to 25 mm2 were used to simulate intramammary calcifications after testing different base substances and calcifications for their suitability to be used in breast phantoms. Breast phantoms were systematically examined using CT and an optimized 3D multi-echo gradient echo pulse sequence with following parameters: TR/TE, 22/1.88-15.52 ms in 1.24 ms increments; reconstructed voxel, 0.5 × 0.5 × 1.1 mm3; receiver bandwidth, 1120 Hz/Px; flip angle, 15°; integrated parallel imaging technique with a GeneRalized Autocalibrating Partial Parallel Acquisition (GRAPPA) factor of 2/24; and a total acquisition time of 3:00 min. A qualitative evaluation of the dependence of the visualization of calcification samples on volume and TE value was followed by a calculation of the SNR, the contrast-to-noise ratio (CNR) and the creation of SWI and QSM in the sense of a (semi)-quantitative analysis of the images. Jello proved to be a suitable base substance for preparing breast phantoms for SW MRI. Blackboard chalk and ostrich eggshell proved to be suitable for mimicking intramammary-like calcifications. The decrease in the median SNR of the blackboard chalk samples was significantly higher than the corresponding value of the ostrich eggshell samples over the entire TE range (47.5 to 17.0 vs. 16.0 to 6.56, P < 0.0001). The increase in the median CNR of the blackboard chalk samples was significantly higher than the corresponding value of the ostrich eggshell samples over the entire TE range (2.46 to 35.0 vs. 20.2 to 36.8, P = 0.007). With increasing TE value, the signal void volume of the calcification particle increases in the magnitude images as well as in SWI and QSM. Due to the blooming effect, the median gradients of the TE-based changes in signal void volumes were higher in SWI than in magnitude images and in QSM, regardless of the type of calcification particle examined. The maximum magnetic susceptibility of ostrich eggshell samples varied in a TE range of 1.88 to 15.52 ms from -7.2 to -2.51 ppm and that of blackboard chalk from -2.0 to -1.7 ppm. Compared to the manually measured volumes of the calcification particles, both MR-based measurements and CT examinations overestimated the actual sample size. The (non)-significant overestimation in the MRI-data is dependent on the set TE. The CT-based hyperdense volumes were overestimated compared to the corresponding manually measured sample volumes in a range of 109.8%-315.2% for ostrich eggshell samples (P = 0.016) and in a range of 39.9%-156.4% for blackboard chalk samples (P = 0.69). Our systematic in-vitro investigation of magnitude images, SWI, and QSM revealed that various set TE values, different volumes, and compositions of calcifications have a significant impact on visualizing intramammary(-like) calcifications.

Biocompatibility and Osseointegration of the Biomimetically Coated and Water-Soluble Eggshell Membrane Protein Cross-Linked Ti Alloy Screws.

The surface properties of dental and orthopedic implants are directly related to their osseointegration rate. Coating and/or modifying the implant surface might reduce the time of healing. In this study, we aimed to examine the effects of a hybrid surface consisting of a brushite surface coating and cross-linked water-soluble eggshell membrane protein on the osseointegration of titanium (Ti) screws under in vivo conditions. Twenty Ti alloy screws were implanted monocortically in anteromedial regions of New Zealand rabbit tibiae. Ten screws were untreated and used as controls. The remaining 10 screws were coated with calcium phosphate and following cross-linked with ostrich eggshell membrane protein. All rabbits were sacrificed six weeks after the surgery. Peri-screw tissues were evaluated by micro-computed tomography (µ-CT), histological and histomorphometrical methods. The μ-CT assessments indicated that the experimental group had significantly higher mean bone surface area (BSA) and trabeculae number (TbN) than those of the control group (p ˂ 0.05). Bone surface area (BV), trabecular separation (TbSp), trabecular thickness (TbTh), and bone mineral density (BMD) scores of the control and experimental groups were quite similar (p > 0.05). The vascularization score of the experimental group was significantly higher than the control group (4.29 vs. 0.92%). No sign of the graft-versus-host reaction was observed. Our findings reveal that coating Ti alloy implants with calcium phosphate cross-linked with ostrich eggshell membrane protein increases the osseointegration of Ti alloy screws by increasing the bone surface area, number of trabeculae and vascularization in the implant site.

New data from old collections: Obsidian and ostrich eggshell beads from the 1977 Mehlman excavations at Mumba rockshelter, Tanzania

Mumba rockshelter in northern Tanzania has served as a key benchmark sequence for understanding Late Pleistocene-Holocene archaeological changes in the region. A complete understanding of the site is complicated by multiple excavations across >90 years, with an unfortunate history of incomplete publication of those results, particularly for some of the older, larger-scale excavations from the 1930s and 1970s. We report here on newly recovered material from the 1977 Mehlman excavations at Mumba. We (1) untangle the complex notation Mehlman used when labeling his artifacts which has led to a misunderstanding of some patterns of change in the past, (2) present the first fully quantitative results of the geochemical analysis and source attribution of obsidian artifacts from Beds III and II at the site, and (3) test and confirm observations about a lack of change in ostrich eggshell bead size at Mumba, a pattern unlike that found at other regional sequences.

Osteoproductivity in Experimentally Induced Cranial Bone Defects in Rabbits.

Autogenous bone grafts are the gold standard for being used as graft materials in maxillofacial surgery. However, a limited amount of these materials is available from the donor site, and there is also more need for a larger operating area and a second surgery, which frequently leads to unreliable graft incorporation, tooth ankylosis, and root resorption. Therefore, newer bone graft substitutes have been developed as alternatives, among which eggshell powder has been introduced as a bone substitute. This study aimed to evaluate the biocompatibility, resorption kinetics, and osteoproductivity of the unprocessed, CMC-coated, and gelatin-coated ostrich eggshell particles. Four half-thickness calvarial defects were created in each animal. At the end of the 1st and 3rd months, the defected sites were investigated by clinical, histological, radiological and histomorphometrical methods. Coating the eggshell particles with CMC and gelatin facilitated their surgical application and contributed to new bone formation. However, their newly formed bone rate at the 3rd month was lower than those of the unprocessed eggshell particles. The CMC coating was more effective than gelatin coating in the bone modeling process. Ostrich eggshell particles either in native form or coated with CMC could be used as a bone filler for supporting new bone formation and healing in treatment of osseous defects.

A preliminary report of the excavation at Spitzkloof D rockshelter, Namaqualand, South Africa

This paper describes the first excavations of Spitzkloof D rockshelter located in the semi-arid desert of northern Namaqualand, South Africa. The site is in a dry river valley 30 km south of the Orange River, which currently acts as a lifeline for pastoralists with mixed sheep and goat herds. A surface survey of the site revealed pottery, lithics, domesticate remains, ostrich eggshell (OES) fragments and jewellery, glass beads and iron fragments. The stratigraphy is complex reflecting multiple occupations with six layers consisting of large hearths, ash deposits, and multiple pits, some with potential votive (faunal) offerings in their base. Faunal analysis reveals a broad subsistence strategy consisting of low-intensity sheep-keeping combined with the hunting of wild species found on the landscape today. The presence of Equus zebra, a locally extinct water obligate species, suggests occupation during a climatic period that was more humid than today. Radiocarbon dates from the upper layers confirm a Little Ice Age occupation between AD 1667-1936, when the region was cooler and wetter, and a peak in radiocarbon dates indicates a population pulse in the region. Glass trade beads, iron implements, OES beads, as well as fish remains and a limpet shell, potentially indicate that the people occupying Spitzkloof D were part of an extensive trade/interaction network. Future analysis will include increasing sample sizes through continued excavation, detailed lithic analysis, and further radiocarbon dating.

Multi-analytical characterisation of red colouration on decorated ostrich eggshells from the Middle Bronze Age in Bahrain

In the early 1960s, a Danish archaeological team excavated a group of mounds in Bahrain dating back to 2000 BCE. Among their finds were fragments of decorated ostrich eggshells that displayed rectangular engravings as well as red colouring on the outer surface and a uniform red tint on the inner surface. The unpigmented natural colouration of ostrich eggs is the result of adaptations to prevent overheating in the arid habitat, and therefore, the red hue was artificial. The aim of this research was to characterise this colouration. Elemental analysis revealed low iron content, ruling out the use of iron-rich pigments such as ochre, while analysis by molecular spectroscopy could not detect any compounds besides the characteristic constituents of the calcareous eggshell. Thermal experiments on modern eggshells, combined with chiral amino acid analysis, indicated that the red colour on the archaeological samples could have been due to exposure to moderate temperatures. This investigation provides valuable insights into the art and cultural practices of ancient Middle Eastern societies during the Middle Bronze Age, contributing to our knowledge of prehistoric archaeology.

Mineralogy and Sourcing of a Stone Bead Industry Found in Communal Cemeteries Associated with Eastern Africa's First Pastoralists, ca. 5000 b.p.

ABSTRACT This article describes the mineralogy and sources for a spectacular stone bead industry associated with the first pastoralists in eastern Africa ca. 5000–4000 cal b.p. Around Lake Turkana, northwest Kenya, early pastoralists constructed at least seven mortuary monuments with platforms, pillars, cairns, and stone circles. Three sites—Lothagam North, Manemanya, and Jarigole—have yielded assemblages of stone and ostrich eggshell beads that adorned interred individuals. Mineralogical identification of the stone beads reveals patterns of material selection, including notable differences among the pillar sites. Geological sourcing indicates use of many local raw materials and two (amazonite and fluorite) whose known sources lie > 200 km away. The data suggest that bead-making represented a significant investment by early pastoralists in personal ornamentation. New sociopolitical factors emerged, such as access to grazing grounds and water, and definitions of self and society manifested in novel mortuary traditions as people coped with a drying, cooling climate.

Methods of In Ovo and Ex Ovo Ostrich Embryo Culture with Observations on the Development and Maturation of the Chorioallantoic Membrane.

Culture of shell-free and windowed eggs for drug testing and other experiments has been perfected for smaller eggs such as those of chickens, where the developing blood vessels of the chorioallantoic membrane (CAM) become accessible for manipulative studies. However, due to the thickness and hardness of the ostrich egg shell, such techniques are not applicable. Using a tork craft mini rotary and a drill bit, we established windowed egg, in-shell-membrane windowed egg, and in-shell-membrane shell-free methods in the ostrich egg, depending on whether the shell membranes were retained or not. Concomitant study of the developing CAM revealed that at embryonic day 16 (E16), the three layers of the CAM were clearly delineated and at E25, the chorionic capillaries had fused with the epithelium while the CAM at E37 had reached maturity and the chorion and the allantois were both 3-4 times thicker and villous cavity (VC) and capillary-covering cells were well delineated. Both intussusceptive and sprouting angiogenesis were found to be the predominant modes of vascular growth in the ostrich CAM. Development and maturation of the ostrich CAM are similar to those of the well-studied chicken egg, albeit its incubation time being twice in duration.

Evaluation of Struthiocamelus eggshell as an in vitro alternative to extracted human teeth in preliminary screening studies on dental erosion.

This in vitro work investigates the potential of ostrich eggshellas a substitute for extracted human teeth in preliminary screening studies on dental erosion. Additionally, it aims to demonstrate the potential of ostrich eggshell compared to human enamel in evaluating the efficacy of a preventive agent in protecting against dental erosion, using an artificial mouth model. The experiment utilized 96 erosion testing specimens from each substrate, human enamel, and ostrich eggshell. The specimens were subjected to six different experimental regimens of increasing erosive challenge, simulating the consumption of an acidic drink. The acidic drink was delivered at a consistent volume and duration range. Both artificially stimulated and unstimulated saliva flowed throughout the experimental regimens. Surface hardness was measured using a Through-Indenter Viewing hardness tester with a Vickers diamond, while surface profiling was done using a surface contacting profilometer with a diamond stylus. An automated chemistry analyzer system was used to detect calcium and phosphate ions. The study found that ostrich eggshell specimens demonstrated predictable surface loss, hardness drop, and ion loss due to the acidic challenge. Meanwhile, enamel appeared to fall short in terms of surface hardness predictability. The transient hardness loss phase, which manifests as an overlooked decrease in surface hardness despite significant ion and structural loss, may explain this phenomenon. The experiment showed that assessing surface loss is essential in addition to hardness testing, particularly as certain experimental conditions may produce a false perception of tissue recovery despite the actual surface loss. By analyzing the response of ostrich eggshell specimens to erosive challenges, researchers were able to identify an "overlooked" reduction in hardness in enamel specimens. The differences in the structure, chemical composition, and biological response to erosion in the presence of artificial saliva between enamel and ostrich eggshell could explain their distinct behaviors.

Kathu Pan 6: Observations on the First Known Buried High-Density Open-Air Holocene Occupation on the Southern Margin of the Kalahari Basin

Abstract This paper presents preliminary results from a newly excavated open-air Later Stone Age site attributed to the Wilton Industry at Kathu Pan 6 in the Northern Cape Province of South Africa. Basic data on the lithics, fauna (including a large ivory fragment), and ostrich eggshell (including beads) recovered during two seasons of excavation (2016–2017) are presented and this material is contextualized through comparison with neighboring sites. Spatial analysis of the artifact distribution from the small exposure from the 2017 season suggests a spatially structured occupation. The Wilton open-air occupation of Kathu Pan 6 offers a new perspective on the poorly understood Later Stone Age of the southern fringes of the Kalahari.

New Pleistocene avian ichnosites on South Africa’s Cape south coast

Twelve new avian ichnosites have been identified on South Africa’s Cape south coast, adding to the 29 sites previously identified. More than half of these 41 avian ichnosites are found along a 9-km stretch of coastline east of Still Bay. The new sites provide the first southern African trace fossil records of the dove, stork and heron families, as well as a possible ostrich trackway and evidence of probable ostrich eggshell fragments. They buttress the previous inference of large avian chronospecies during the Pleistocene. The preponderance of large- and mediumsized tracks can be attributed to a bias whereby fossil tracks of larger, heavier birds are easier to recognise and interpret. Four of the longest fossil avian trackways ever to be identified occur within a 350-m stretch of coastline in the Driefontein area, east of Still Bay. The new findings provide an enhanced picture of the Pleistocene avifauna of the region. Many of the new sites are fragile and have limited prospects to endure, emphasising the need to document them through photogrammetry, and to regularly explore the coastline in high-yield areas in search of further sites.

Integrated Information on the Structure and Composition of the Ostrich Eggshell (Struthio camelus)

Ostrich eggshells are excellent examples of avian biomineralization. Interest in these eggshells is focused on their potential as a food source, example of a biomaterial for medical and industrial applications, and the use of fossil remains for paleoenvironmental reconstructions. Due to this interest, there is some information about aspects of eggshell biomineralization, but it is scattered in different publications and is limited in scope about mineralogy-crystallography and/or composition. Here, we re-examine the biomineralization of the Struthio eggshells focusing on the structure, from macro- to nano-scales, crystallography, and composition of mineral and organic phases. Our results show that there is a very tight biomineralization control, from well-defined structures at nanoscale to precise crystallographic orientation of calcite crystals, in the formation of a biomineral that is unparalleled in other avian eggshells. Overall, this finding would explain the thickness and excellent mechanical properties of ostrich eggshells.