Like Noos, Mopoos live in the clouds, but they fly out from underneath Kirby as he walks or flies nearby. Be very careful when you see either a Mopoo or a Noo—they tend to hang out together and don't announce their arrival. ” — Description • Official Strategy Guide (Prima) Kirby 64: The Crystal Shards 
Mopoo is an enemy in , Kirby's Dream Land 3 , and Kirby 64: The Crystal Shards . It is a white-and-blue spherical ray with a happy face and a white tail that is made up of smaller white rays. It usually hangs out in the cloud and snow levels. Mopoo leaps or flies around and gives no Kirby's Return to Dream Land ability when swallowed. A giant Mopoo is the mid-boss at the end of Stage 2 of Shiver Star in Kirby 64: The Crystal Shards, with smaller Propellers to be inhaled and fired at it.
Use the ivy to climb higher and higher into the sky - but beware of the enemies that pop out of the clouds. ” — Official European website Kirby's Return to Dream Land
The Prima strategy guide for Kirby 64: The Crystal Shards is flawed; it states that Noos attack Kirby by flying at Kirby and that they appear alongside Mopoos in the clouds.
Zebon and Mopoo are greatly similar in appearance in official artwork, aside from having different colors.
Kirby 64: The Crystal Shards (mid-boss)
Prima Kirby 64: The Crystal Shards guide