relative dating crocodiels

A study of tinamou, a paleognath avian, and American alligator test subjects found that while the paleognaths were able to engage in visual perspective taking — a cornerstone of advanced social cognition — the alligators did not appear to do so. Bird speculated that Deinosuchus "may very well have hunted and devoured some of the dinosaurs with which it was contemporaneous". Species with sharp teeth and long slender snouts, like the Indian gharial and Australian freshwater crocodile, are specialised for feeding on fish, insects, and crustaceans, while extremely broad-snouted species with blunt teeth, like the Chinese alligator and broad-snouted caiman, specialise in eating hard-shelled molluscs. In other projects. With their crown of front teeth, some of which exceeded 18 inches in length they would have been formidable hunters and a 3 metre Metriorhynchus would have been no match for this mighty pliosaur. This process is known as biostratigraphy — using key fossils to date rocks. Phylogenetic analysis places Deinosuchus as a basal member of Alligatoroidea , as shown in the simplified cladogram below: [1].

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