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:
The warblers of North America . Plate XIII Yellowthroated Warbler Male Yellowthroated Warbler Female Grace's Warbler Male Grace's Warbler Female Blackthroated Gray Warbler Male Blackthroated Gray Warbler Female onehalf natural size Plate XIII Illustration biodiversitylibrary org title Chapman Frank Biodiversity