When you think of a hummingbird you probably think of a small sweet bird. But, hummingbirds are also very aggressive, especially males. According to a new study, some female hummingbirds are evolving ...

A lot of people are familiar with the idea that many birds are color-coded by sex: males are brilliant whilst females are drab. But hummingbirds have turned this perception onto its head because in ...

White-necked jacobin hummingbirds sport a colorful blue-and-white plumage as juveniles. When they grow into adulthood, males retain this dazzling pattern, while females develop a more "muted" palette ...