"A humpback who approached me peered into my eyes while I was aboard a boat and showed me the mirror of myself." ...

Tusks are a striking feature of many animals -- elephants, hippos, warthogs, walruses -- and are often sought-after by humans. But no birds, fish or reptiles today sport this extreme and ever-growing ...

First, no one is sure why we, or any other animal, dream. During the past century, however, scientists have made significant progress in understanding the factors that influence sleep and dreaming.

The lower jaws of lizards, birds, fish and even dinosaurs are comprised of multiple bones per side. Yet mammals diverged from all other vertebrates and settled on just one bone, repurposing the extra ...

Bats are flying mammals you might spot and — rarely — hear at nighttime. Here are three common bat sounds — and what they mean.

A new fossil shows a badger-like mammal biting into a dinosaur. The mammal was significantly smaller than the dinosaur and may have hunted in packs or solo. Researchers thought dinosaurs attacked ...

Have you ever wondered why you don’t have thick hair covering your whole body like a dog, cat or gorilla does? Humans aren’t the only mammals with sparse hair. Elephants, rhinos and naked mole rats ...

In an effort to protect grasslands, a plan to cull pikas and zokors in China is having the opposite effect, say scientists. Melissa Breyer is Treehugger’s former senior editorial director. Her writing ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. The idea that most biologically male members of a species are ...

Fluorescence found to be extremely common among mammals, and may be the "default status" — but exactly why that is remains unclear, scientists say. When you purchase through links on our site, we may ...

A highly contagious avian flu is infecting birds all over the globe. In the U.S., farmers have lost, or had to kill, over 58 million birds to try and prevent the spread of the virus. The H5N1 strain ...

From the 20-foot-long jawbones of the filter-feeding blue whale to the short, but bone-crushing, jaws of the hyena and the delicate chin bones of a human, the pair of lower jawbones characteristic of ...