Evolution of sea slugs
From Anarchy In Action
A result of symbiosis, sea slugs are animals capable of photosynthesis, "actual plant-animal hybrids".[1] The ancestor of the sea slugs ate green algae. Instead of being digested, the algae entered the animal's tissue, allowing the animal to acquire photosynthetic genes. Today, adult sea slugs never eat. Instead, they crawl to the shore and sunbathe like plants do. Whereas the ancestors were grey, sea slugs are green.[2] The species emerged not from competition or random mutations, but from a merger between an animal species and a plant species.
