Beware, spoilers within.
Edit: Yes, I found the animations in the game files. There's no prefab/stategraph/brain associated with them yet, so I just made a blank prefab that played a series of animations. The small one is called "slip" or "slips" by the files, and the big one is called "slipstor". They both have transformations, and they seem to align decently, so I'm guessing the slip transforms into the slipstor under some condition.