Spikey (Super Mario Land 2: 6 Golden Coins)

A Spikey is an armadillo-like enemy found in the game Super Mario Land 2: Six Golden Coins. It can only be found in the first level of the Tree Zone, near the base of the giant tree. A Spikey's attack pattern consists in curling himself up into a ball, then dashing forward in an attempt to ram Mario. Despite their having spikes, Spikeys can be defeated by jumping on their heads, or shooting a fireball at them.

Trivia

 * Spikey bears a resemblance to the Army, another armadillo enemy from the Donkey Kong series.