10. Dino Eggs
To the untrained eye, these might look like just plain old rocks, but they’re actually giant dinosaur eggs–the largest ones ever found. Researchers discovered these giant eggs in the 1990’s and each one measured to about two feet in diameter, which scientists believe are as large as it gets. The larger the egg, the thicker the shell, and it’s thought that if they were much thicker the babies would have trouble getting out. It’s known that all dinos laid eggs, and over 40 types have been discovered.