Yes, there really is a “cookie” shark. They are called cookiecutter sharks because they carve out a circular plug of flesh when biting their prey. Only one or two feet long, these aggressive...

Octopuses are stealth hunters that feed on prey such as crabs, lobsters, and shellfish—and even other octopuses. They grasp the prey with strong suckers, enveloping it in their webbed arms while...

The lifespan of great white sharks is thought to be up to 70 years or more, which is far longer than earlier estimates. This makes it one of the longest-living cartilaginous fishes currently known....

These are the world's most dangerous fish. You might find a few surprises on this list. Have you ever heard of the Goonchfish? If you ever plan on visiting the Kali river region in India, I...

Contrary to popular belief, cannibalism—the act of eating members of one's own species—occurs frequently in the natural world. For examples of animals that prey on their own kind, continue...

Eagles and other birds of prey have the best visual acuity of any group of animals. It is four to eight times better than ours. A soaring eagle can spot a rabbit from 2 miles (3.2 km) away. The...