Oldale, R. N., Whitmore, Frank C., Jr., and Grimes, J. R. 1987. "Elephant Teeth from the Western Gulf of Maine and their Implications." National Geographic Research ...

Tusks are one of the most notable features of elephants, among their size and trunks. However, some elephants do not have tusks, and a high proportion of these elephants are females. Why do some ...