Apatosaurus used to be known as brontosaurus, following a labelling error on a very similar specimen. Subsequently renamed, Apatosaurus was one of the larger sauropod dinosaurs, and therefore one of the largest animals ever to have walked the Earth. Peg-like teeth effectively stripped leaves from trees, but were no use for chewing, so Apatosaurus probably swallowed stones to grind up its meals in the gizzard. Enormous size, herding behaviour and a whip-like tail would all have provided valuable defence against the meat-eaters of the time.
Scientific name: Apatosaurus
A comparison of the enormous Apatosaurus's size in relation to humans.
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Additional data source: Animal Diversity Web
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