Eep Cheep

Eep-Cheeps are a sub-species of Cheep-Cheeps first found in New Super Mario Bros. Wii. They are similar in appearance to Cheep-Cheeps, although they are golden in color and will swim away from Mario when he gets close.

New Super Mario Bros. Wii
Eep-Cheeps make their first appearance in New Super Mario Bros. Wii. They appear in groups, called Eep-Cheep Schools. They'll swim away from the player whenever they get close, the opposite behavior of Deep-Cheeps.

New Super Mario Bros. U
Eep-Cheeps return in New Super Mario Bros. U. They retain the same behavior.