This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Abbildungen von VogelSkeletten Tafel CII . Meyer Abb Vogelskeletten Tafel CIL Tetrao tetrix ft em Tafel CII Illustration biodiversitylibrary org title Meyer Adolf Bernhard NameFound Tetrao tetrix NameConfirmed Tetrao tetrix EOLID NameBankID Biodiversity Heritage Library Abbildungen von VogelSkeletten Anatomy Birds