We Don’t Really Know Why Dinosaurs Were So Big

From the fossil evidence, it's clear that dinosaurs were more massive than any other group of land animals that ever lived.

Animals & Nature We Don't Really Know Why Dinosaurs Were So Big From the fossil evidence, it's clear that — species by species, individual by individual — dinosaurs were more massive than any other group of land animals that ever lived. And while there are a few theories about why, no one is sure which one is true. READ NOW Advertisement READ THESE 10 Dinosaur "Facts" Researchers Still Fight Over Today Many Familiar Mammals Were Much (Much) Bigger Yes, Your Earliest Ancestor Is This Tiny Shrew You are receiving this newsletter because you subscribed to the Today I Learned newsletter. If you wish to unsubscribe, please click here A Dotdash Brand 1500 Broadway, 6th Floor, New York, NY, 10036 © 2017 Dotdash - All rights reserved. Privacy Policy.