From the Super Mario Wiki
Ants are enemies in the Tree and Macro Zones of Super Mario Land 2: 6 Golden Coins. Much like Goombas, they walk and march into enemies. There actually appear in two different sizes; in the Tree Zone they are the same size as Mario, but in the Macro Zone where Mario is smaller, they are the same size as regular ants. In the Macro Zone, Mario visits an ant nest during the first stage, where he faces numerous Ants of various kinds. There are many different varieties, such as the spiked Chikunto, the digging Goronto and the heavily armed Dokanto. A standard jump or a fireball are enough to defeat a regular Ant.
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