They are first seen in Blue Moon Bay.
Nutter Butters resemble the Nutty Butter cups, except with two wild eyes and a zig-zag mouth. They have small brown feet and a brown propeller on top of their head.
They hover up and down continuously in midair, and pose no immediate threat unless they are run into.
While they are flying, weapons will stun them, rather than defeating them in one hit like land enemies. While stunned, they are vulnerable to attack.
Knocking them out of the air and into water will cause them to regain consciousness and start hovering again.