Did you know that the American Molossus Dog is the largest dog in the world? You're about to find out! In this video, we're taking a look at the American Molossus Dog, one of the largest dogs on the ...

Owls are often seen as quiet observers, but the largest species are powerful nocturnal predators. This video ranks all seven ...

Whether you call him groundhog, woodchuck, whistle-pig or use the full genus and species name, Marmota monax, the nation’s ...

Why do humans have larger penises than other primates? New research tests attraction, rivalry, and sexual selection for ...