A Cow can sometimes be seen flying on the top of the screen in Metroid Prime Pinball. This is particularly interesting, as cows are known to be featured as easter eggs in pinball games.
It is known to rarely appear on the Pirate Frigate while playing Shriekbat Shootout, but the method of triggering it is unknown. It is a small winged cow with wings similar to the Winged Ripper's that makes a moo sound when it appears. It can be shot and killed when Samus is in Combat Saucer mode, and when this is done, it explodes in a small flash of bright light. However, doing this yields no points, since it is not an enemy. If it flies into Samus, she will take no damage and receive 100,000 points.