A green honeycreeper spotted on a farm in Colombia exhibits a rare biological phenomenon known as bilateral gynandromorphism. By Emily Anthes Colombia is a bird watcher’s paradise. Its stunningly ...

Scientists just recently decided to study female birds. What they found astounded them. Some female birds, like the two red-legged honeycreepers (Cyanerpes cyaneus) pictured above in Costa Rica, have ...

Researchers have discovered an extraordinary, vibrantly colored tropical bird with "female" feathers down one side of its body and "male" feathers down the other. Female green honeycreepers ...