image: Beak color variation in different bird species. Above left, a Medium Ground-Finch fledgling with a yellow lower beak begs for food from its parent.

UPDATE 3:42 p.m.: The last remaining Yellow Finch tree sitter that was arrested earlier this afternoon has been identified by authorities. According to the Montgomery County Sheriff’s Office, 24 ...

Most zebra finches have a bright orange-to-red beak. But one kind of mutant zebra finch has a yellow beak. Turns out that these yellow-beaked birds have multiple mutations in and around their P450 ...

On the Galapagos Islands, a ground finch that usually munched on small, soft seeds was forced, during a drought, to eat harder, larger ones. Within the space of a few generations, the bird evolved ...