This was actually answered here, BUT the short version: mostly the only native fauna on Barrayar are insects, anything else you find out there is Earth-descended. Most of it is small game and descended from specimens that escaped into the wild early in Barrayar's history: mostly things like rabbits, squirrels, small birds; the only natural predators around here are birds of prey. There are also Earth-imported fish that live in the rivers and lakes. You might also get the occasional wild sheep or pig descended from some that escaped.