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The scientific name for the California sea hare is Aplysia californica.
The California Sea Hare, or Aplysia californica has gills inside its body. This is how it extracts oxygen from the water.
No they are harmless to humans
Aplysia californica
A sea bunny, or sea hare, is an underwater creature that is a hermaphrodite. A hermaphrodite is a living thing with two sexes inside one body.