Mammals are among the most adaptable animals on the planet. They are found on every continent and in every ocean, and range in size from tiny bumblebee bats to enormous blue whales. One reason for ...

Its brain is proportionally larger than those found in living reptiles, so the animal may have been as intelligent as modern birds, which are more similar in brain size. Troodon walked (and ran ...

Reptiles first appear in the fossil record 315 million years ago and were the dominant animals during the Mesozoic era, which lasted for 270 million years until the extinction of the dinosaurs.

What is a woolly monkey? An animal called a woolly monkey seems like it should live in the frozen north, not the sweltering Amazon Basin. But the thick coat of fur covering these large primates ...

Tigers and monkeys and tapirs, oh my! Joel Sartore's latest book, "National Geographic Photo Ark: Babies," captures the ...

These solitary, aggressive animals are famous for their ferocious punch—as fast as a bullet and strong enough to snap a crab’s claw. Mantis shrimp live in warm, shallow waters in the Indian ...

Some transport water, oxygen, and carbon dioxide either into or out of the animal. Others fight bacteria or fungal infections. And at least one—in each species—is used for defense. To warn ...

Hermit crabs are omnivorous scavengers, eating microscopic mussels and clams, bits of dead animals, and macroalgae. These crustaceans have been misnamed for two reasons: First, they’re not true ...

The oldest winged fossil dates back 330 million years ago, suggesting that insects were among the first animals to leave the oceans for land during the Devonian period some 400 million years ago.

There are reports of giant stingrays weighing up to 1,300 pounds, though such accounts are not verified because weighing the enormous and awkward animals is very difficult. Brown to gray in color ...

Nevertheless, Emmanuel Gheerbrant, a researcher for the National Center for Scientific Research in France, speculates that Africa "must have been a laboratory for some very peculiar animals." ...

Sea dragons survive on tiny crustaceans such as mysids, or sea lice. It is not known if they are preyed upon by other animals. They are, however, frequently taken by divers seeking to keep them as ...