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Evidence that they existed in the Southern Hemisphere has been mounting.Today's announcement of a well-preserved fossil represents the first definitive evidence that dromaeosaurs roamed South America as well.It has a long head and long tail and wing-like forelimbs.Its serrated teeth, like steak knives, suggest it was a carnivore.The scientists say they found what appear to be hammerstones and stone anvils at the site, showing that ancient humans had the manual skill and knowledge to use stone tools to extract the animal's Bone Marrow and possibly to use its bones to make tools.

Toward the end of the Jurassic period, it split in two.The discovery changes the understanding of when humans reached North America.The study, to be published this week in the science journal Nature, said the numerous limb bones fragments of a young male mastodon found at the site show spiral fractures, indicating they were broken while fresh.Legend: Mesoamerica = Mexico and Central America Pre-Columbian = Before Christopher Columbus Amerindian = Indigenous Indians of North and South America Paleoindian/Paleoamerican = The original Black settlers of the Americas The discovery of a bird-like dinosaur in South America has paleontologists rethinking when, where and how one group of raptors evolved.The rooster-sized dinosaur is called Buitreraptor (bwee-tree-rap-tor) gonzalezorum.

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