allosaurus dinosaur was a large jurassic theropod predatory dinosaur

allosaurus fragilis dinosaur theropod carnivore predator reptile lizard meat eater animal themes biped bull extinct north america jurassic period era age epoch extinction vertebrate organism claws talon teeth evolution prehistoric primitive primeval creature natural history genus species wild wildlife rendering nature white background isolated large predatory lived late fossils found america#39aph39#s morrison formation