From the Super Mario Wiki
Munchelangelos are mice enemies who appear in Wario: Master of Disguise. They appear in the S.S. Caviar. Other varieties of rodents on the ship are DaVincheeses, Ratfaels and Mini Munchelangelos. They attack by jump-charging at Wario, trying to bite him. They can be killed in just one hit. Their name is a pun on Michelangelo, a famous Italian Renaissance artist. Along with the other mice enemies in the game, they can occasionally be seen lifting their heads up, allowing a pair of eyes to peek out, suggesting they are actually a smaller creature in a costume.
This happy little mouse has been living high on the hog on a luxury liner. Too much time at the buffet has engorged his belly to epic proportions.
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