There's a species of sea slug, Elysia chlorotica, that only needs to eat when it is very young.
It gorges on algae, stealing their ability to harness the sun's energy, and then proceeds to sunbathe for the rest of its 10-month life.
But it's hardly alone: Other animals also take on some traits of plants in order to give them an edge against competitors. From solar-powered aphids to algae-embedded salamanders, these animals serve as living biology lessons and could be used to better understand immunity and improve gene therapy.
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