Ant Troopers are ant-like enemies that are pretty harmless if you look at them, as they simply move in a set pattern. They are able to cling to the walls, too, and will sometimes emerge from holes or pipes. Jumping on them normally won’t defeat them, but your character can simply use them to get across treacherous spots, if needed. However, you can use a Ground Pound to send them packing, as well as attacks from the Cat Suit, Tanooki Suit, and even Rosalina’s spin move. Even projectiles, like the Fire Flower and Boomerang Flower, work as well.
There are two more variations of them, the Big Ant Trooper and the Horned Ant Trooper. The former cannot be defeated at all and function the same as normal ones, although you can still jump on them to get across dangerous areas. Horned Ant Troopers, although they can’t be jumped on at all, can still be defeated in the other manners described above. Sometimes, you will find that the Ant Troopers are carrying power-ups or coins on their back.