Scientists have been wondering for a long time how Mammoths became extinct, and now they think they have the answer. Warmer weather, rain, and forrests killed off the shaggy elephant-like creatures who used to roam the earth between 1.8 million and 10,500 years ago. The trees cast shadows over the low-level gass and bushes that the Mammoths used to eat, and the Mammoths were too big to move around in the woods.

You can read more about this in the National Geographic.