Orange-billed tern is a name applied to a group of three large terns in the genus Thalasseus with orange bills, which are quite similar in appearance and often considered difficult to identify, namely:
- Royal Tern, Thalasseus maximus
- Lesser Crested Tern, Thalasseus bengalensis
- Elegant Tern, Thalasseus elegans
The Greater Crested Tern (Thalasseus bergii) and the Cayenne Tern (Thalasseus sandvicensis eurygnatha), which have yellow rather than orange bills, are sometimes also considered part of this group.
Read more about Orange-billed Tern: Identification