Bird claws and bird of prey talons: Where is the difference?
| Autor: | Orazio Rossi, Davide Csermely |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Italian Journal of Zoology. 73:43-53 |
| ISSN: | 1748-5851 1125-0003 |
| DOI: | 10.1080/11250000500502368 |
| Popis: | The questions asked were (1) whether claws and toes of birds of prey are actually different from those of other perching birds, and, if so, (2) what parameter can describe such a difference. The structure of toes and claws of the first and third toe was then evaluated in three groups of birds: Falconiformes, Strigiformes and non‐raptorial species. One adult male per species was considered, and, among non‐raptorial birds, only species belonging to typically or partially perching families. Only one specimen per species was chosen, from museum skin bird collections. All species examined occur in the western Palearctic, according to Cramp & Simmons (1977–1994). Discriminant Function Analysis showed clear separation of the groups. In particular, the first canonical function segregated Falconiformes from Strigiformes, whereas the second separated Strigiformes from non‐raptorials. However, Falconiformes and non‐raptorials partially overlapped and were not separated. The characteristics segregating Falconiformes ... |
| Databáze: | OpenAIRE |
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