Isotopic analyses of fossils suggest crocodile-like habits
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