These are filled with chlorophyll, and the green pigment gives the sea slugs' bodies a leaf-like color. This not only helps them blend in with their surroundings to better hide from predators but ...

Meet the leaf sheep, a cute little animal-plant hybrid that can photosynthesize to generate extra energy within its body.

Scientists have discovered the ultimate case of regeneration: Some decapitated sea slugs can regrow hearts ... It turns a shade of green and gets its energy from oxygen and sunlight.