There are three cows in Black Rose, and rumours go there could be a fourth one. Each cow is triggered during play, but they will not always appear.

1. A shot around the back orbit will generate a whole herd of cows all over the screen and a nice mooing noise.
2. When the ball is in the pops, you sometimes get fencing cows instead of fencing pirates.
3. Millions+ is sometimes accompanied by cows on the display.