From the Super Mario Wiki
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Some are stationary and some jog around in a set path, and can be defeated by any attack. However, Skipsqueaks have a good jump height which makes them dangerous enemies. The mice are usually found in groups of two or more. Skipsqueaks make their first appearance in the level Really Rolling Hills and make appearances in Grumblump Inferno and Rainbow Run. There is a subspecies of this creature known as Spiny Skipsqueaks which also appear in Cookie Cogworks and again in Rainbow Run.