There are roughly ten thousand bird species on earth, all with their own particular diet and feeding behaviors. They range from specialized feeders associated with specific plant species to ...

The avian endocrine system consists of a series of glands that produce and secrete substances known as hormones. These steroids or proteins travel through the bloodstream and act as chemical ...

Despite their incredible diversity in shape, color, and size, most people find it easy to distinguish birds from other vertebrate classes like mammals and reptiles. The tiny, jewel-like Hummingbird is ...

Browse our growing list of species guides to learn all about birds.

Discover the extraordinary achievements and unique characteristics of these remarkable birds.

Each bird family carries a unique tale of evolution, habitat, and behavior. From the majestic raptors to the enchanting songbirds, discover each family in our in-depth guides below to start learning ...

Browse our growing list of species guides to learn all about birds.

This map shows the combined distribution of all species in the Cracidae family.

Browse our growing list of species guides to learn all about birds.