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Deep Cheeps (originally parsed 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.
Super Mario series
New Super Mario Bros.
New Super Mario Bros. Wii
In New Super Mario Bros. Wii, Deep-Cheeps are slightly more common. One appears in World 1-4 along with a Mega Deep-Cheep. If Mario and co. keep staying in the area, another pair of green fish enemies appears. Deep-Cheeps can also be encountered in the second part of World 8-4.
In this game, their lips have become pink, matching the current depiction of a Cheep Cheep's, rather than keeping the red-orange colored lips they and Cheep Cheeps previously had in New Super Mario Bros. Their dorsal fins and tails have also become yellow, as opposed to white. There is a more relentless enemy similar to Deep-Cheep known as Spiny Cheep Cheep.
New Super Mario Bros. 2
Super Mario Maker / Super Mario Maker for Nintendo 3DS
Deep Cheep reappears in Super Mario Maker and Super Mario Maker for Nintendo 3DS. They aesthetically replace green Cheep Cheeps and Blurps in the New Super Mario Bros. U style, except that they no longer chase the player due to the green Cheep Cheeps and the Blurps from other styles not being able to chase Mario. Furthermore, the voice heard when placing Deep Cheeps onto the course just calls them Cheep Cheeps.
Mario Party 9
New Super Luigi U
Though Deep Cheeps did not appear in New Super Mario Bros. U (despite them receiving official artwork for that game), they still appear in New Super Luigi U, behaving the same as in previous games. Their only appearance is in Cheep Chomp Chase.
Yoshi's New Island
In Yoshi's New Island, Deep Cheeps appear as obstacles in Submarine Yoshi sections, replacing Piscatory Petes from previous games. Rather than swimming in the direction of the player, they swim in a wide wave pattern contrary to red Cheep Cheeps, which simply move forward. Like the original New Super Mario Bros., their faces do not have an angered expression. Furthermore, the official Japanese guide simply considers them to be generic green Cheep Cheeps.
Names in other languages