ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Brachiosaurus dinosaurs. Artwork of four Brachiosaurus dinosaurs feeding in a forest of tree ferns next to snow-capped mountains. Flying pterosaur reptiles are seen in the sky, and a Stegosaurus dinosaur is at lower right. Brachiosaurus was the tallest dinosaur, standing up to 16 metres tall. It could weigh up to 70 tons. Unusually for a dinosaur, its front legs were longer than its hind legs. It was herbivorous, probably feeding on leaves high in the trees. It lived in the late Jurassic period, between 155 and 145 million years ago. It is thought to have been a social animal, living in herds.
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