Alamosaurus, (IPA: /ˌæləməˈsɔɹəs/; meaning "Alamo lizard"), is a genus of titanosaurian sauropod dinosaur from the Late Cretaceous Period of what is now North America. It was a large quadrupedal herbivore, up to 53 feet (16 metres) in length and up to 33 tons (30 metric tonnes) in weight. Alamosaurus, like other sauropods, had a long neck and a long tail, which may have ended in a 'whiplash' structure.