Rodent is faithful, monogamous. Or he strays. Why?

The prairie vole is one of the few monogamous (mostly) mammals. What goes on in the brain that causes the guys to stray? More »

Tropical mountain diversity: species rise from below, but also travel from afar

Herculean taxonomy expedition reveals dual origin of tropical mountain organisms. More »

Reptiles have many ways to set the sex of offspring. Temperature often matters. Could global warming make male “dragons” extinct? More »

Two billion years ago, we share a common ancestor with this new-found relative. Is this our origin? More »

Two teeth from Kenya identify an ancient hippo and clarify the evolutionary link to whales and dolphins. More »

People eat birds unto extinction: Witness the passenger pigeon and heath hen in North America or the moas in New Zealand. More »

Behavior changes when animals compete — a perfect setup for evolution through natural selection. More »

A look at long-distance migration reveals surprising pattern. Migration did not originate in the tropics, home of bird diversity. More »

Even before the high-speed evolution of the Cambrian explosion, one shelled organisms lived by the thousands in groups that offered More »

Just 22 million years after the “Cambrian explosion,” a top predator had already evolved into a filter-feeder, able to sweep up food More »

A whale fossil from 28 million years ago shows compelling evidence for echolocation — the ability to “see” objects by listening for More »

Mating displays attract females — and predators. A Panama bat listens for the túngara frog. If it “sees” ripples the frog makes More »

What could be more distinct than that? How about reptiles: Some do eggs, some do birth, and some switch back and forth over the eons. More »

Bad feet? Aching back? Impacted wisdom teeth? Blame balky designs inherited from your relatives. How has evolution equipped — or More »

A common mole never sees the light of day, but it can pinpoint the source of food in just a few seconds — thanks to its newfound More »