The creatures may not rely on the photosynthetic ability of the chloroplasts that lend them their colour.
They’ve been called 'solar-powered slugs' and 'leaves that crawl' — species of sacoglossan sea slug that assimilate the photosynthetic organelles in the algae they eat, causing their bodies to turn bright green. But it turns out that these slugs can survive months of starvation even when their photosynthetic capacity is massively reduced, casting doubt on the widely-accepted theory that they rely on photosynthesis to feed themselves when there’s nothing around to eat.
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