Orange-billed tern

Orange-billed tern is a colloquial name applied to a group of four large terns in the genus Thalasseus with orange bills, which are quite similar in appearance and often considered difficult to identify, namely:

The greater crested tern (Thalasseus bergii) and the Cayenne tern (Thalasseus acuflavidus eurygnathus), which have yellow rather than orange bills, are also sometimes considered part of this group.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.