Leaf Sheep!

By: Catherine Tu

Allow me to introduce to you the leaf sheep. Contrary to its common name, this little creature is a species of sea slug spanning 5mm to 1 cm. Scientifically named Costasiella kuroshima, these adorable creatures are found in the tropical waters surrounding Japan and Southeast Asia.

Leaf sheep undergo a process called kleptoplasty, which is derived from the word ‘klephts’ meaning ‘thief’. This special ability stems from their diet, allowing them to retain the chloroplasts (organelles responsible for photosynthesis) from the algae they consume. This makes them one of the only animals that can photosynthesize, albeit in an indirect manner. This process also gives these creatures their green color, offering camouflage and chemical defense against predators. Its two “bunny ears” are rhinophores--chemosensory organs that act as taste and scent receptors. The egg masses containing their offspring are shaped into tiny spiral coils.

While leaf sheep aren’t an endangered species, because they live in areas surrounding coral reefs, their habitats have felt the effects of illegal fishing, pollution, and climate change. If no changes are made, even these cute critters will be jeopardized. So next time you toss out some plastic garbage, think of these little guys and make the responsible decision and keep the environment clean!