Many animals transform themselves almost beyond recognition in the course of their lives. Caterpillars become butterflies and tadpoles become frogs, and if we couldn’t watch them do so we might not even suspect that the two stages were the same creature. Spectacular as these shifts are, they are only shape-shifting. A tadpole and a frog are both animals, so both must take in food from their surroundings. Not so Mesodinium chameleon. This newly discovered single-celled organism is a unique mixture of animal and plant.