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 ...

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 ...

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

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 ...

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

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

Apart from the unusual monotreme mammals of Australia, the combination of internal fertilization, oviparity (egg-laying), and advanced parental care is unique to avians. From flashy feathers and ...

Ghosting through boreal forests with eerily silent flight, this massive owl's piercing yellow eyes and distinctive facial disc make it a haunting presence in northern wilderness areas. The Great Grey ...

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 ...