I heard that elephants can regrow their tusks – is it true?
Humans grow two sets of teeth in their lifetimes – the rootless “milk teeth” of childhood and the second, rooted set of teeth which are supposed to last into old age. With the amount of food elephants eat every day, their teeth wear down at alarming rates, and that’s why they grow not two but six sets of chewing teeth (molars) in their lifetimes. Tusks do not wear out so fast, so an elephant does not grow more than one set in its life. In fact, tusks are rootless, just like human milk teeth. However, they do continue to grow in length throughout the lifetime of the elephant.
