Protoceratops. Late Cretaceous, 75–72 million years. Genus of sheep-sized (1.8 m long) herbivorous ceratopsian dinosaur (like Triceratops). Art by Maurice Wilson.

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Megatherium. Early Pliocene to Early Holocene, 5–0.010 million years. Extint gebus of ground sloth. Skeleton in Natural History Museu, London (via Wikipedia, Creative Commons). Art by Maurice Wilson.

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Lystrosaurus. Late Permian–Early Triassic, 255–250 million years. Herbiverous Dicynodont (two tusks). Art by Maurice Wilson.

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Hyracotherium. 55–45 million years. Prehistoric small, dog-sized horse. Art by Maurice Wilson.

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