They can grow up to 2 inches/ 5 centimeters and swim up to 0.22 mph/ 100 mm/s.
Sea angels are a type of gelatinous, transparent slug and can swim two times faster than their prey the sea butterfly. The sea butterflies have a protective shell that the sea angel will pull their bodies out of and eat through the protrusions on their head. The protrusions, called buccal cones, have hooks and a kind of toothed-tongue on the inside.
