Zombie Squirrel?

I just learned something: "On very rare occasions, when their usual food sources are scarce, eastern gray squirrels also prey upon insects, frogs, small rodents including other squirrels, and small birds, their eggs, and young."
http://en.wikipedia.org/wiki/Eastern_gray_squirrel#Diet

There goes that cute disney style impression i had of squirrels

nearly all herbivores occasionally eat other animals or chew on their bones or somesuch

That's so strange. To me they say "you're next"