I recall reading a short story back in the 80's that featured some biologists who ran across a pack of carnivorous chipmunks in a national park.
They would gang-up on larger creatures, like owls, and devour them. At the book they drop from a tree and attack one of the main characters. It seems like he survives.
I am not certain where I would have read it, but it seems like it was in a school textbook.