Female Grant's gazelles, Serengeti Plain

A Horny Proposition

Why do some female bovids have horns, whereas others don’t?

Ruby-throated hummingbird

Flexible Feeders

The lower bill of the hummingbird makes a nectar-drinking beak into one for catching insects.

humpback whale and seal

Save the Seal!

Whales act instinctively to save seals

child photographing anteater

An Anteater Named Teddy

Even as a pet, his single interest was in ants, and he never quite got used to a tame chimpanzee.

White Winged Vampire Bat

The Curious, Bloody Lives of Vampire Bats

Vampire bats display adaptations to their diet

To Kill a Cormorant

Are double-crested cormorants overrunning their niche—or recovering from centuries of suppression?

Expedition Headquarters

Bones in the Brewery

A Paleontologist's Rendezvous with History and Prehistory in St. Louis

rage in three guises

What Are They Thinking?

Characteristic facial expressions, postures, and movements are the key to an understanding of animal psychology and the soul of animal art.

Tail of Uromastyx geyri

Tails

Caudal Appendages Adapted by Nature to the Needs of Her Creatures

lesser honey guide

Profiteers of the Busy Bee

Observations on the Honey Guides of Africa

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Recent Stories

Fossilized cell remnants in 3.4 billion-year-old bedrock are from primitive microbes. 

Frog hoppers piercing plants with their mouthparts produce negative pressures exceeding a megapascal. 

An Okinawa citrus species arose two million years ago when the Ryukyu archipelago disconnected from Asia.

Astronomers have detected a disk around a planet outside our Solar System for the first time.