Lion rape and kill cubs that aren't theirs. They aren't a good measure of morality which is what is primarily being discuss here.

Primate brains may have grown larger and more complex thanks to a fruit-filled diet, a new study suggests.

http://www.npr.org/sections/thesalt/2017/03/27/521423216/what-gave-some-primates-bigger-brains-a-fruit-filled-diet