Elephants are the largest land animals on Earth ... Both male and female African elephants grow big tusks, but only a few male Asian elephants grow full-size tusks. The rest of the males and ...

Elephants' large ears perform the same task. Could land animals evolve to ginormous sizes again in the future? Well, perhaps. But it's not likely they'd be as big as titanosaurs or other sauropods.

Some of these giant vegetarians were as tall as a 3-story building. Microscopic analysis of their teeth, bones and eggshells reveals how they grew, what they ate and even their body temperature.