Brachychampsa had short teeth and a large mouth that packed more power than those of living gators. They are also cannibalistic, so they eat other crocodiles that are smaller. Crocodylinae, all of whose members are considered true crocodiles, is classified as a biological subfamily.A broader sense of the term crocodile, Crocodylidae that includes Tomistoma, is not used in this article. Variation and Evolution of the Salt Water Crocodile. Alligators and crocodiles are both relics of the dinosaur age, facing an uncertain future as humans encroach on their territory. A new study of crocodilian genomes led by scientists at UC Santa Cruz reveals an exceptionally slow rate of genome evolution in the crocodilians (a group that includes crocodiles, caimans, alligators, and gharials). - Due to the cannibalistic nature of crocodiles, crocodiles of the same size are usually found living together in small groups. Evolution helps us to understand the history of life. Today, most of the land-dwelling crocodilians live in tropical lowlands, while the broad-snouted American and Chinese alligators have adapted to cooler temperatures. It lived in modern eastern Asia, and became the modern crocodile and dinosaur. The Evolution of Crocodiles/Alligators By: Hasan Ekram and Ryan Johnston . While many of today’s top predators are more recent products of evolution, the modern American alligator is a reptile quite literally from another time. - Crocodiles eat birds, invertebrates, reptiles, and mammals; including humans. Crocodiles (subfamily Crocodylinae) or true crocodiles are large semiaquatic reptiles that live throughout the tropics in Africa, Asia, the Americas and Australia. Except, it turns out, alligators. In Exploring the World of Alligators and Crocodiles, young readers will learn about the crocodilians' life history, It was only 3 feet long, and was 5-10 pounds. Evolution is the result of the tendency for some organisms to have better reproductive success than others with changes in gene frequency in a population from one generation to the next. 250-200 million years ago: The Xilousuchus lived in Eastern Asia, and was a rather small animal. New study also shows it shared ancient Florida with giant crocodiles. The alligator family includes the caiman, and the crocodile family includes the gavial; they are found in many parts of the world.

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