ok...the basics are:
chop tree animation: the beaver should "chew" at the ground...as if chewing down a tree
Mine animation: if it could dig into the ground or something...did you see Aaglo's Skaven paradrop?...something like that, with the dirt moving
Irrigation Animation: walk backwards and pat with tail...holding a rake or something, and digging as he walks backward
no attack needed, and the fidget/fortify/and move animations can be anything...Beaver doesnt have any memorable motions or anything, except the tail pat thing...
there are pics in the link in my siggy, if you need size comparison...
Oh and he wears no clothes at all, in case you were wondering(I think Mr Beaver may have a scarf, but forget it)
{edit} he does look like he's made of chocolate...yummy...but watch out, the Easter bunny is gonna get mad at a beaver stepping on his turf
(edit 2) the arms are a little small...they are right for a normal beaver, but Narnian beavers have more pronounced arms
{edit 3} Storm, have you EVER seen eys on a unit in civ scale?? Not counting undead eyesockets, or Godzilla & Friends