- Research Article
- 10.15641/bo.1990
- Dec 20, 2025
- Biodiversity Observations
- Corrie Du Toit + 2 more
The Nuwejaars River and its associated wetlands lie in the Heuningnes Catchment, situated within the Overberg region in the province of the Western Cape, South Africa. Large areas of invasive alien vegetation have been cleared from the floodplain of the river. Over the period 2018 to 2024, 452 records of 25 species of Odonata (dragonflies and damselflies) were made in the Nuwejaars Wetlands Special Management Area. Although the results are not confirmed by quantitative data, it is clear that the abundance of odonatids has increased since the removal of the infestations of alien invasive vegetation from the floodplain. The most unexpected species was Spesbona Spesbona angusta.
- Research Article
- 10.15641/bo.1959
- Oct 27, 2025
- Biodiversity Observations
- Bruce M Dyer
Pied Crows Corvus albus were first observed on Robben Island in 1987, on Dassen Island in 1997, on Malgas Island in October 2008, and on Jutten Island in 2011. On both Malgas and Jutten Islands, pairs of Pied Crows bred in disused guano sheds. Prey items were collected, identified and counted; they were mainly eggs of seabird species in threat categories. On both Jutten and Malgas Islands the recommended strategy is to eliminate nest sites for Pied Crows on the islands, and on the adjacent mainland. Dassen and Robben Islands are relatively far from the mainland, and a culling strategy is recommended, especially because these islands have important breeding colonies of the Critically Endangered African Penguin Spheniscus demersus.
- Research Article
- 10.15641/bo.1957
- Oct 23, 2025
- Biodiversity Observations
- Les G Underhill + 1 more
As South Africa’s contribution to the Eighth International White Stork Census in 2024, we reported that two pairs of White Storks had constructed nests. For one pair, a well-built nest was usurped by Egyptian Geese. The other pair almost certainly laid eggs, but the outcome of the breeding attempt is not known.
- Research Article
- 10.15641/bo.1942
- Oct 13, 2025
- Biodiversity Observations
- Les G Underhill
The primary idea behind the concept of a floater is the occurrence of non-territorial individuals which move over large areas, waiting for an opportunity to join the breeding population. A hooligan is defined here as a floater which behaves aggressively, even engaging in fighting to disrupt breeding pairs in order to gain a territory.
- Research Article
- 10.15641/bo.1866
- Oct 10, 2025
- Biodiversity Observations
- Makhudu Josiah Masotla + 5 more
Robben Island, Table Bay, South Africa, is an Important Bird Area, and many of the seabird species breeding on Robben Island are of conservation concern. In particular, the African Penguin Spheniscus demersus is Critically Endangered. The island hosts 18 species of reptiles. During the 2024 annual African Penguin census, a Mole Snake Pseudaspis cana was observed attempting to constrict and presumably overpower an adult African Penguin. This is a phenomenon which has not previously been observed. This incident serves as a reminder of the many challenges face by the African Penguin.
- Research Article
- 10.15641/bo.1879
- Aug 11, 2025
- Biodiversity Observations
- Otto Makola + 2 more
This study documents the first recorded instance of interspecific competition for nesting cavities between the endangered Cape Parrot Poicephalus robustus and the Broad-billed Roller Eurystomus glaucurus. Both are secondary cavity-nesters occupying overlapping habitats in southern Africa. Despite the Cape Parrot’s earlier breeding season, which theoretically affords it priority access to cavities, a roller pair was observed attempting to use an actively occupied Cape Parrot nest. This rare interaction reveals potential interspecies conflict where nest-site selection overlaps. Additional examples from both African and Australasian regions suggest that breeding season timing and cavity characteristics often mitigate competition among avian species. The impact of the roller usurping a Cape Parrot nest was significant as only three out of 13 known nest sites were active in 2024 and only one was known to be successful. Therefore, with Cape Parrot populations having dwindled to fewer than 2,000 individuals and breeding success vulnerable to habitat damage and predation, understanding all limiting factors, including interspecific interactions, is vital for conservation. Long-term monitoring across regional nodes underscores the importance of protecting preferred nesting sites to ensure reproductive success and species longevity.
- Research Article
- 10.15641/bo.1860
- Jul 11, 2025
- Biodiversity Observations
- Iñaki Romero Iraola + 2 more
This bibliogaphy lists 200 publications providing baseline knowledge, historical context and perspective, information relating to long-term data sets, and also insights into species, ecosystems, and human impacts on Robben Island, a protected area and UNESCO World Heritage Site since 1999. This platform of knowledge will enable researchers to design better studies, avoid redundant work and measure change. It will also help to identify knowledge gaps, and to guide policy and management decisions.
- Research Article
- 10.15641/bo.1528
- Jun 25, 2025
- Biodiversity Observations
- Raju Vyas
This paper presents the seven known records of avian predation on the Indian Chameleon Chamaeleo zeylanicus in India and Sri Lanka. There were four observations in which the predator was the Crested Serpent Eagle Spilornis cheela, with single predation events being made by Greater Coucal Centropus sinensis, Rufous Treepie Dendrocitta vagabunda and Malabar Paid Hornbill Anthracoceros coronatus.
- Research Article
- 10.15641/bo.1823
- Jun 25, 2025
- Biodiversity Observations
- Martin Potgieter
During a visit to the Van Staden’s Wild Flower Reserve near Gqeberha, Easern Cape, South Africa, a group of Cape Sugarbirds Promerops cafer was observed engaging in active anting. Although anting is a well-documented behaviour among various bird species, it appears to be rarely observed or reported in Africa. This may represent the first recorded instance of anting in Cape Sugarbirds.
- Research Article
- 10.15641/bo.1808
- Jun 19, 2025
- Biodiversity Observations
- Anita Studer + 3 more
The Yellow-faced Siskin Spinus yarrellii is a Vulnerable species with declining populations and little data on its reproduction. Some of its reproductive parameters are presented here, having been obtained in the northeastern region of Brazil, in the state of Alagoas, when four nests were monitored between 1991 and 2009 near the Pedra Talhada Biological Reserve. The nests were located in trees in anthropogenic areas and capoeiras at heights ranging from 2 to 5 m. We measured three of them, resulting in averages of 9.7 cm in external diameter, 4.7 cm in internal diameter, 6 cm in external height and 2.8 cm in internal height. Clutch sizes ranged from three to four eggs. Incubation lasted 11 to 12 days, with both parents participating, and chicks fledged between 10 and 11 days. Our records seem to be one of few that reveal information on the reproduction of this species. Our observations demonstrate undemanding nest site selection, with siskins utilising exotic plant species and disturbed environments for reproduction. Despite this adaptability, Yellow-faced Siskin populations face significant threats from illegal wildlife trade and habitat destruction with the indiscriminate use of pesticides on crops and pastures, which continue to intensify in the species’ habitat. With this study, we hope to provide valuable insights into the reproductive ecology of the Yellow-faced Siskin and contribute to broader conservation strategies for this rare and declining species.