Two Hummingbirds and an Orchid

Are There “Transgender” Proclivities in Animals?

We tend to think of gender expression as uniquely human. But many species gain advantages by projecting an opposite-sex appearance.
Badger group

What Birds, Coyotes, and Badgers Know About Teamwork

 Mutualism is a relationship between organisms where both benefit.
frigate bird

The Astounding Adaptations of Long-Distance Flyers

Frigate birds are truly champion fliers. The birds can fly for weeks without stopping. How do they do it?
Illustration of two house sparrows

The Great Sparrow War of the 1870s

The "sparrow war" in the United States in the 1870s ended with a resounding victory… for the sparrows. 
European Starlings

What If We Had All the Birds from Shakespeare in Central Park?

According to birding lore, two of America's most invasive bird species were introduced by a misguided Shakespeare fan named Eugene Schieffelin.
Sapayoa aenigma, Nusagandi, Panama

The Sex Lives of Birds

Deep in a Central American rainforest, ornithologists have discovered that a rare bird has an unusual lifestyle.
Cormorants on a Guano Island

Are We Entering a New Golden Age of Guano?

A history of civilization could be written in fertilizers. And the history of guano—bird poop—tells us a lot about slavery, imperialism, and U.S. expansion.
Secretarybird with a snake, Masai Mara, Kenya

Meet the Secretary Bird, Snake Nemesis

If snakes have nightmares, they most likely include secretary birds (or secretarybirds)—so-called because the birds’ crests, when flattened against the head, ...
Blackpoll Warbler (Dendroica striata) on branch

Birdstor Daily

Once upon a time, it felt appropriate to make April Fools' jokes...
Camouflage

Teddy Roosevelt Weighs in on the Evolution of Camouflage

In the years after his presidency, Roosevelt sent a letter to The Condor magazine criticizing painter Abbott Thayer's theory of animal camouflage.