There is another cause for the changes that are evident in extinct animals, possibly even people, with features seldom if ever found among living specimens. In Jasher, Enoch, and even slightly in Genesis, it is recorded that some sort of genetic tampering was done that angered God. Also Jasher reports that as punishment for the tower building, God caused 1/3 of those involved to be morphed into ‘elephants and apes.’ While this sounds like a bit of myth, and it could be, there is a condition known as elephantitus that causes features that would fit this description.