They include some of the largest animals on Earth. The blue whale is the biggest animal that has ever existed. Whales can be ...

Some of these giant vegetarians were as tall as a 3-story building. Microscopic analysis of their teeth, bones and eggshells ...

African savanna elephants are the biggest elephant species ... is also making elephants' remaining environment less safe. As Earth warms, their home turf becomes more likely to face water ...

African elephant tusks nearly double those of the walrus ... regular teeth because they don’t even fit inside the animal’s mouth — then some of the biggest teeth belong to the hippopotamus. The lower ...

A replica fossil of the titanosaur _Patagotitan_, one of the largest dinosaurs ever discovered. It would have weighed about 70 tons (63.5 metric tons.) Spencer Platt/Getty Images News via Getty Images ...