Cornell Lab study reveals a U.S. bird population decline affecting 75% of tracked species. eBird data shows widespre ...

Hermit crabs change shells throughout their lives, most commonly during a process called molting, when the animal sheds its exoskeleton.

Hummingbirds are extremely skittish and aren’t easy to see all the time. In fact, it takes a lot of effort to create environments where hummingbirds feel safe enough to frequent throughout the year.

An investigation of the American crocodile produced surprising results. Discover more about the two new crocodile species in the Yucatán.

Butterflies are disappearing at an alarming rate in the US. Find out which species are the most impacted and what can be done to help.

When attacked, pufferfish swell to three times their size. This trick helps them survive in the wild. Here's why.

Here are some of the most interesting facts about great white sharks. These often misunderstood apex predators are critical to the ecosystem.

Spotted hyenas have massive premolars and zig-zag enamel that let them devour tough carcasses with unmatched efficiency.

From deep bellows to high-pitched screams, koalas make a range of sounds that help them mate, fight, and survive.

Iguanas are increasingly popular as pets. But these reptiles aren't for beginners. Here’s everything to consider before purchasing an iguana.

Geese can be territorial and aggressive if they perceive a loved one is in danger and have even attacked humans because of it ...

Scientists have been monitoring the disappearance of great white sharks from False Bay, South Africa, but where have they ...