A sea slug in the waters off Bali
© Media Drum World/Alam
Solar-powered sea slug. Adorably evolutionary sea sheep
Perhaps you can understand why this tiny sea slug is sometimes called the ‘sea sheep’ or ‘leaf sheep’? They graze on algae just as sheep graze a pasture, and they bear more than a little resemblance to actual sheep. Sea sheep don’t digest the chloroplasts in the algae they eat, they absorb the energy-producing cells. The leaf-like fins all over the sea-sheep’s back are loaded with working chloroplasts, making the sea sheep one of the only non-plant lifeforms on Earth with the ability to photosynthesize—producing its own energy using sunlight and water. Who knew an evolutionary advancement could be so cute?
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