Known as “America’s wolf,” red wolves are the only species of wolf that lives in the United States—and nowhere else.

Slowly stalking down the snowy hillside, the Amur leopard watches its prey through the trees. In the clearing below, a sika ...

Wherever there is dung (also known as poop), there are most likely dung beetles. They belong to three basic groups: rollers, tunnelers, and dwellers. Those words describe how these beetles use the ...

Christmas Island red crabs are famous throughout Australia and the world for their bright red color and for their spectacular annual migration to the sea. Millions of crabs become rivers of red as ...

These seabirds are known for their wild look and sound—no wonder they're sometimes called the rock stars of the penguin world. Many penguins thrive in freezing conditions. They shrug off subzero winds ...

Komodo dragons are the biggest and heaviest lizards on Earth. Full-grown adults can reach 10 feet (3 meters) long and weigh more than 300 pounds (140 kilograms)! Most weigh about 150 pounds (70 ...

The Gila monster is one of only a few poisonous lizards in the world. The Gila (pronounced HEE-luh) is the largest lizard ...

Burmese pythons, one of the largest snakes in the world, are best known for the way they catch and eat their food. The snake uses its sharp rearward-pointing teeth to seize prey, and then coils its ...