There are two Zingers in the GBA port that were never seen in any of the levels, the red one and the purple one. They seem to be only used for the Credits screen for some reason, so you could say they are the unused Zingers. Anybody care to explain why they were never used in any of the levels?
EDIT: Those two Zingers have been bothering me for awhile since I've seen them, what could they do if they were actually used in the levels?