We know dinosaurs were big, but how big were they? And how do we even know? Luckily, paleontologists and other scientists know how to find the answers. By measuring fossils, comparing them to the ...

Whales range in size from the blue whale, the largest animal known to have ever lived on Earth to various pygmy species, such as the pygmy sperm whale that reaches a length of around 10 feet. Whales ...