Documented cases of deer (and other “strict” herbivores) munching on carrion or killing and eating small, weak animals (such as baby birds) are not entirely uncommon, though people are frequently shocked to learn that it occurs. It is speculated that some deer may crave calcium or other minerals which they can get from eating the bones of animals, or they may resort to consuming animal protein when they can no longer find plant proteins in the wild. This deer ate all 4 legs off of a frozen rabbit that was left out as bait for coyotes.