Eggbert
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Eggberts are small egg-like enemies found exclusively in the Tree Zone of Super Mario Land: 6 Golden Coins. Although considered a species, there is only one known Eggbert located in the fourth room of the Beehive, which is the third level of the Tree Zone. Despite their rarity, Eggberts aren't much of a threat. They circle around, slowly moving toward Mario to attack. Mario could easily defeat one by jumping on top of it or shooting a fireball at it.
Eggberts also appeared in Super Mario RPG: Legend of the Seven Stars where they would be spit out by Birdo, in place of normal Birdo Eggs.