Aivukus is an extinct genus of walrus from the Miocene. From fossil records it was a much bigger, but had a walrus skeleton, but much enlarged. It probably ate fish.[citation needed] The behavior was quite different, as fossil hunters have uncovered two skeletons with large chunks out of the backs of their tusks, which was too hard to have been a fight between the two, it was quite like a rock had scratched it, or they used their tusks to mark their territory on rocks.[citation needed]
[edit] Sources
- Marine Mammals: Evolutionary Biology by Annalisa Berta, James L. Sumich
- Encyclopedia of Marine Mammals by William F. Perrin, Bernd Wursig, and J. G.M. Thewissen
