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.

Trivia

 * The name "Eep-cheep" is a combination of the word Cheep-Cheep and "eep" - a short scream of discomfort when frightened easily in reference to the eep-cheeps nature of running away from Mario and living in schools for protection.
 * Before the release of New Super Mario Bros. U, the eep-cheep was simply regarded as a yellow variant of Cheep-Cheep that had different characteristics - such as the difference between a Koopa Troopa with a green shell as oppose to one with a red shell.