Deep-Cheep

Deep-Cheeps are a special variety of Cheep-Cheeps that are first found in New Super Mario Bros. They appear to be regular Cheep-Cheeps, except for the fact that these creatures are green and will swim in the direction of Mario or Luigi in underwater levels depending on the direction they swim in. Deep-Cheeps will only give up pursuing Mario or Luigi provided the latter ones swim behind and past the fish foes. 

Deep-Cheeps are a special variety of Cheep-Cheeps that are first found in New Super Mario Bros. They appear to be regular Cheep-Cheeps, except for the fact that these creatures are green and will swim in the direction of Mario or Luigi in underwater levels depending on the direction they swim in. Deep-Cheeps will only give up pursuing Mario or Luigi provided the latter ones swim behind and past the fish foes.