Abstract
In the past decade, the population of the Hooded Crow has shown significant growth in Debrecen, Hungary. The aim of this study was to become acquainted with the nest-site selection behavior of Hooded Crows in urban spaces. While our research revealed that the Hooded Crow is not particular when it comes to selecting among tree species for nesting, we did notice differences regarding nesting height. Hooded Crows living in the city build their nests higher up than those living outside Debrecen’s city limits. We also discovered a slight, insignificant difference between nesting heights and tree species, which is probably due to the different characteristics of the given tree species. As for nesting heights, we found that in typical urban habitats there were no relevant differences. However, when we compared these habitats in pairs, it came to light that nesting heights -when comparing solitary trees - wood segments and tree rows - wooded segments- did show significant differences, which can be explained by the various conditions provided by the habitats mentioned.In summary, the following results emerged from our research:1. The Hooded Crow prefers approximately the same nesting heights in all kinds of habitats, urban environment and tree species.2. The nesting height does not significantly depend on the habitat itself or on the tree species.
Highlights
The urbanization of the Hooded CrowThe urbanization of birds is concurrent with the development of civilization
Nesting height was between 12-21 meters, with an average of 16.22 meters (Table 1)
After examining the nesting heights of Hooded Crows, the results revealed no important difference between habitats (Kruskal-Wallis test, H=3,559, df=3, p=0,313)
Summary
The urbanization of birds is concurrent with the development of civilization. This process is an active and expansive phenomenon. There are the possibilities provided in urban settings for nesting and diverse sources of food (Kalotás 1995, Bedő & Heltai 2003, Vuorisalo et al, 2003). Cities provide defenses against predators (Kalotás 1995, Vuorisalo et al 2003). But not least, Hooded Crows are highly intelligent and ecologically flexible (Konstantinov et al 1982, Ilyichev et al 1990; Von Busche 2001), and these traits led them to adopt the excellent habitat cities provide
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