From the Super Mario Wiki
A Mecha Cheep is a mechanical version of Cheep Cheep that first appears in New Super Mario Bros. U. They have metal fins and a wind-up key at the back similar to that of Mechakoopas.
A Mecha Cheep in New Super Mario Bros. U
In the game, Mecha Cheeps appear only in the level The Mighty Cannonship. They're impervious to Fireballs, but can be defeated with an Iceball or Star, or by leading a Targeting Ted into them.
Mecha Cheeps appear in Mario Kart 8 in the underwater section of Water Park and on posters seen in the building at the beginning of this course.
- The back of the Mecha Cheep resembles a Poké Ball. It can be seen if it was tapped in Boost Mode.
- ^ Stratton, Steve (November 18, 2012). New Super Mario Bros. U: Prima Official Game Guide, page 33. Retrieved April 10, 2015.