Unit5 Dinosaurs 5.0 / 5 based on 1 rating ? GeologyDiplodocusTyrannosaurusIguanodonEvolution of BirdsA2/A-levelOCR Created by: Gabby-ACreated on: 19-05-16 13:35 Saurischia - Sauropoda 1 of 8 Diplodocus Herbivore common in the Jurassic and the Cretaceous Long slender skull Long neck carried parallel to the ground Peg-like teeth found towards the front of the jaw, to ***** leaves off branches Swallowed stones (gastroliths) to break down vegetation in the digestive system Whip-like tail used: as counter balance, for communication or for defence Adults moved in packs of 30 and had no natural predators 2 of 8 Saurischia - Therapoda 3 of 8 Tyrannosaurus Carnivore common in the late cretaceous Was probably a scavenger as well as a predator (opportunist) Small eyes in terms of body size, poor vision Tail used as counter balance for head Small arms allow for a large mouth whilst still allowing it to balance on hind legs 4 of 8 Ornithischia - Ornithopoda 5 of 8 Iguanodon Herbivore common in the late Jurassic Would become bibedal to run or rear up and swing it's spike-like thumb in defence Tail used as counter balance when quadrupedal Toothless beak used to crop vegetation Leaf-shaped cheek teeth (resembling iguana teeth) used to mince it's food 6 of 8 Evolution of Birds 7 of 8 Evolution of Birds Birds are thought to have evolved from Therapod dinosaurs in the Jurassic The first birds had many skeletal similarities to coelurosaurs (a type of therapod) Similarities include: Hollow thin-walled bones (to make bones lighter) S-shaped curved neck Elongated arms and forelimbs, with clawed hands The pubis shifted to a backwards position Large eye sockets in the skull Hinged ankles (reduces rotation of the ankle) 8 of 8
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