Impossible Plant-Animal Hybrid

Wildly bizarre half-plant/half-animal creature - with a lovely name "Eastern Emerald Elysia" This beautiful leaf-shaped sea slug Elysia chlorotica lives in shallow pools along Atlantic coast of North America, eats algae with gusto - one meal is enough for its lifetime! - and by using photosynthesis like any other plant, shatters the most basic definition between the "animal" and "plant" kingdoms.