Atlantic horseshoe crab (Polyphemus occidentalis) illustration from Zoology of New york (1842 - 1844) by James Ellsworth De Kay (1792-1851).

The Horseshoe Crab: Same as It Ever Was?

The seemingly static appearance of these ancient-looking arthropods presents a challenge for scientists who want to study their evolutionary history.

What Is Chronobiology?

Does it explain why we’re having so much trouble sleeping?
The Irish Elk

The Cartoonishly Giant Antlers of the Irish Elk

The mystery of the Irisk Elk's giant antlers attracted the attention of famous evolutionary biologist Steven Jay Gould.
Source: John D. & Catherine T. MacArthur Foundation

Richard Prum: How Does Beauty Evolve?

Prum speaks on Darwin’s idea of sexual selection, the importance of arbitrary traits, and why he could never choose a favorite species of bird.

Love, Sex, and Cyanide—The Private Life of a Toxic Butterfly

Heliconian butterflies choose mates with similar wing patterns. Their genes make them do it.
Venezuela Tepui Highlands

Venezuela’s Mysterious Tepuis

Many species on the tepui summits are found nowhere else. How did those species get there?
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.
Greenland Shark illustration

Slow, Steady, and Very, Very, Very Old

Why do Greenland Sharks and Pacific Rockfish live for hundreds and hundreds of years?

Can You Hear It? The Cicadas Are Back

After 17 years quietly developing under the soil, 3 species of periodical cicadas emerged this summer. How do these insects coordinate?
Elk in Yellowstone National Park

National Parks Are Like Islands for Wildlife

There’s no doubt that national parks are good at getting people in touch with the natural world. But how good are they at conserving wildlife?