You can use them to buy items in your Mascot D.E.N.
Save the zoo animals by splatting them with bubblegum!
-Snakes spit out bubblegum-blowing Guinea Pigs
-Click the lever to make the snakes spit out a Guinea Pig
-Launch the Guinea Pig as close to the other zoo animals as you can; the better your aim, the faster they'll be covered in gum (and the higher your score will be)