The Shearblug is a member of the Mandiblard Family featured in Hey! Pikmin. They are small white Mandiblard with a shell on their back and can turn into a rolling spiky ball if they see Pikmin or Olimar.
The Shearblug is able to live under and over water unlike most other Mandiblard, it is usually wandering around until it comes across Olimar or its Pikmin then it will turn into a spiky ball and roll in their direction. If they are not in their ball form, they can be killed in only one hit.
Hey! Pikmin Log
"What an odd creature! It lives on both land and water, and seems puffy, but shows spikes when threats approach. I find myself curling up when scolded as well, but alas, I have no spikes to present. What can I say? I'm a pacifist."