Sail-backed dinos had semiaquatic lifestyle | Science News

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Sail-backed dinos had semiaquatic lifestyle

Isotopic analyses of fossils suggest crocodile-like habits

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12:41pm, February 12, 2010

Paleontologists may have solved the mystery of how spinosaurs and tyrannosaurs — two dinosaur groups that included many large, fierce predators — could have lived in the same regions at the same time. A new study suggests that, like many pairs of surly neighbors, they simply avoided each other.

Spinosaurs, the sail-backed dinosaurs made famous by a star turn in the movie Jurassic Park III, belonged to a group of meat-eating dinosaurs called theropods. But unlike tyrannosaurs and most other theropods, spinosaurs had conical, unserrated teeth similar to those found in crocodiles, says Romain Amiot, a paleo

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