Ankka

The Duck (in-game name Ankka) is a passive animal that can only be found on the small island in the middle of the Lake. As it is a passive creature, it has no attacks and drop no gold when killed.

The Flock of Ducks spell summons several of these to fly around the area, however unlike their natural counterparts these ducks only live for a short while until they explode in a shower of blood and gore.