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A Boss Bass is a large carnivorous Cheep-Cheep with close eyes and a large front tooth. Its first appearance was in Super Mario Brothers 3. It reappears in Lets-a-go, Mario and Ultra Mario World. It has a female counterpart called a Big Bertha. The modern enemy Cheep-Chomp seems to have replaced it - though Boss Basses hunt on the surface and are red or orange - and occasionally green. Cheep-Chomps hunt underwater and are purple.
Boss Bass reappears for the first time in a while in Lets-a-go, Mario. It acts just like it did in Super Mario Bros. 3. However, it has a new and potentially more dangerous sub-species in this game, Snow Bass, which cannot jump, but can spit snowballs at things, freezing them.