A man able to shapeshift into a beast, willingly or not. The most common form of this is the werewolf. If the individual is not human, there should be a clear physical distinction between their regular and their werebeast state.

While the prefix "were-" designates a (human) male individual, with "waif-" being the correct prefix to use for females, both genders whould be tagged as werebeast (as well as the appropriate subtag) regardless.