Mulldozer

Quote from The Legend of Zelda: The Minish Cap Mulldozer figurine: "Appears in Minish roads, dungeons, etc. There are red and blue ones. They may look small and weak, but their hard shells make them formidable."

Mulldozers are small, speedy, lady-bug like creatures. When they spot you, they will get into a frenzy and start sliding around the place. A few simple blows would kill them. Link encounters them only in The Minish Cap, due to the fact that they are incredibly small and would never be fought by a normal sized Link.