 The worlds oldest large organisms are bizarre creatures. One of them, an eyeless, mouthless, gutless fish called Dickinsonia, absorbed food through its flat body as it slunk along the ocean floor. Then theres a sort of U-shaped slug known as Kimberella, which may have eaten while moving backwards. But as unusual as these 550-million-year-old species ... Partner Content How algae could be the answer to everything... 