Go to level 2 in two player mode with Bantam and Chick. You will eventually see a little stump with an egg on it. Keep hatching eggs in the area and you will get the "evolution" egg animals, evolution egg hats, and even an evolution bomb which goes out on a fuse. Go to level 2 in two player mode. Go to the white egg and hatch it. A secret animal
will come out. Note: The egg may change colors, depending on the type of animal.