Originally Posted by MacGruder
Think about how many animals have existed on Earth... I wonder what percentage survive in some form to be found at a later date. It must be an incredibly minuscule number of animals. I think we underestimate how much history could just completely disappear and we have no record of it whatsoever. Entire eras could be literally wiped off the face of the Earth because of global catastrophes.
Yup. Camels, horses, sloths disappeared from North America. They all ended up elsewhere surviving. How, why, nobody really knows. Mastodons and Mammoths disappeared entirely, nobody really knows why. The saber tooth cat, etc, same deal.