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 ...

In his lab at Indiana University, James Goodson keeps violet-eared waxbills – a stunning but notoriously aggressive type of finch. Males and females form life-long bonds but they don’t play well with ...

Around 20 percent of female white-necked jacobins have evolved to share the vibrant plumage characteristic of males. sam may via Flickr under [CC BY 2.0] Female hummingbirds are ditching their drab ...

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 ...

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 ...

1 in 5 adult female white-necked jacobin hummingbirds look like males. New research shows that this is a rare case of 'deceptive mimicry' within a species: Females with male-like plumage are trying to ...