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Joan Cartan-Hansen,Host:

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Dinosaurs can be split into

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two groups based on their hips.

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Saurischians or lizard-hipped

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dinosaurs have a pair of hip

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bones that pointed forward or

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down.

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They include meat-eating

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theropods like Allosaurus and

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some plant-eaters like

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Diplodocus.

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Ornithischians or bird-hipped

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dinosaurs had two pairs of hip

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bones pointing backwards.

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They were all plant eaters.

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Scientists think birds evolved

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from lizard-hipped dinosaurs

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rather than bird-hipped

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dinosaurs.

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But new research thinks there

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may be other ties.

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Sometimes, new discoveries test

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old ideas.

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In 1854, a life-sized sculpture

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of an iguanodon went on display.

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The dinosaur had a horn on the

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tip of its nose.

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Scientists now think the horn

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was actually a misplaced thumb

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bone.

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Check out the science trek

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website for more information

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about this and all our science

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topics for kids.

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You'll find it at

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ScienceTrek.org

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