Life on Earth started out microscopically small, but it didn’t stay that way for long. Here are five of the biggest creatures to have ever called planet Earth home.

Whales are a group of mammals that live in oceans. They include some of the largest animals on Earth. The blue whale is the biggest animal that has ever existed. Whales can be found in every ocean, ...

New research shows prairie dogs play an outsized role in nutrient cycling, adding to their list of beneficial services as ecosystem engineers. Soil nutrients support plants, and the animals who ...

Have you ever wondered what the biggest land animal in history looked like, or which creature ruled the oceans as the largest of them all? Prehistoric giants often come to mind, but the story goes ...

There are 41 species that fall under the Felidae – or cat – family, according to the International Society for Endangered Cats. No matter its size, your cat probably acts like it's an apex predator or ...