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Dilophosaurus is a genus of theropod dinosaur. It contains a single known species, Dilophosaurus wetherilli, known from fossil remains found in the Kayenta Formation of Arizona....
Deinonychus is a genus of carnivorous dromaeosaurid coelurosaurian dinosaurs, with one described species, Deinonychus antirrhopus. This species, which could grow up to 3.4...
Compsognathus is a genus of small, bipedal, carnivorous theropod dinosaurs. Members of its single species Compsognathus longipes could grow to the size of a turkey...
Coelophysis is an genus of coelophysid theropod dinosaur that lived approximately 203 to 196 million years ago during the latter part of the...
The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, forest-dwelling Eohippus into the modern horse....
How new species are created is at the core of the theory of evolution. Mammals may be a good example of how sex chromosome change drove major groups apart.
Bony skull ornaments appeared in most rapidly growing species, new research suggests.
Everyone is once again asking, “Can we clone dinosaurs?” The answer is easy: No. But there’s more to the story than just cloning.
Albertosaurus is a genus of tyrannosaurid theropod dinosaurs that lived in western North America...