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 ...

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.

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 ...

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 ...

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

Maintaining a high metabolic rate and body temperature places an extreme demand on a bird’s respiratory system, especially during the intense physical exertion required for flight. Rapid oxygen ...

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

Birds are an incredibly diverse group of animals that have conquered almost every habitat on Earth. One thing every avian has in common is their origin in the egg. Although the shell’s size, shape, ...

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 ...

Birds aren’t distributed randomly across the globe. Instead, each habitat supports its own unique collection of bird species that have evolved to live there. Picture a deep green forest, an open ...