![]() ![]() Rear-fanged snakes are considered less dangerous than other venomous snakes. The work appears in Proceedings of the National Academy of Sciences journal. ![]() The dinosaur probably fed on the abundant birds which inhabited what is now north-east China. Sinornithosaurus’s upper teeth resemble those of “rear-fanged” snakes which bite their prey and channel venom into the wound. Other estimates have compared the fragmentary material to relatively complete titanosaurs to help estimate the size of Argentinosaurus.Ī bird-like dinosaur that prowled an ancient forest 125 million years ago used venom to subdue its prey, according to a new theory. Paul estimated Argentinosaurus at between 30–35 metres (98–115 ft) in length and with a weight of up to 80–100 tonnes (88–110 short tons). The proportions of these bones and comparisons with other sauropod relatives allow paleontologists to estimate the size of the animal.Īn early reconstruction by Gregory S. The holotype included three anterior dorsal vertebrae, three posterior dorsal vertebrae, first to fifth sacrum vertebrae (only ventral sector the vertebral bodies), most of the sacral ribs of the right side, great part of a fragmented dorsal rib, and the right tibia. Not much of Argentinosaurus has been recovered. Argentinosaurus is a genus of titanosaur sauropod dinosaur first discovered by Guillermo Heredia in Argentina. The dinosaur lived on the then-island continent of South America somewhere between 97 and 94 million years ago, during the mid Cretaceous Period.
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