Boanthropy

In cases of boanthropy, victims come to believe that they are in fact cows. Having arrived at this belief, they begin to act like cows.

Boanthropy is related to lycanthropy. People afflicted with lycanthropy think that they are wolves. Legends of were-wolves were probably started by individuals afflicted with the condition. One could refer to an individual with boanthropy as a 'were-cow'. Were-cows have gained nowhere near the notoriety of were-wolves, perhaps because no one cares what happens to grass.