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 ...

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 ...

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, ...

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 ...