I can't tell how long this has been... I'd assume after the battle sprites came out? I can't remember.
Anyway, if a Tier 3 Wolver decides to burrow into the ground and pop up behind you and follow with a bite immediately after popping out, it will have its curled up model inside it. Not only Wolvers, but Alphas too. It's nothing game-breaking but I thought it was worth pointing out nonetheless.
******SCREENSHOT COMING SOON******