Southern stingray (Dasyatis americana) foraging for food in the sand. This stingray has a poisonous tail barb, which can inject venom from a gland at its base. The resulting injury can cause severe pain, poisoning and long-term illness in humans. The southern stingray can also inflict damage with its serrated spine. It buries itself in the sand during the day and forages at night for molluscs, worms, crabs, shrimps and small fish. It can reach a length of around 2 metres. Photographed off the Cayman Islands, in the Caribbean.