200px-Yao Guai
Yao Guai are a species of mutated black bears. Although generally found alone, Yao Guai exhibit a gentle, familial bond toward one another when found together, provided they do not feel threatened by the observer's presence. Yao Guai will attack nearly any other animals or people they encounter, including deathclaws. However, Yao Guai have been known to be occasionally friendly towards bloatflies. There are tamed Yao Guai which can be seen following and protecting their masters in the Capital Wasteland.