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In 1963, what John Ostrom, an American paleontologist, discovered was a claw, obviously goes to a foot, but not for walking on. Deinonychus was small with a delicate build and was an active predator that clearly killed its prey by leaping and slashing or stabbing with its “terrible claw”. It ran upright on two legs. It had a long stiff tail for balance. He saw that they both had lightly-built, hollow bones. And they shared even more features, including long arms and similar hip and shoulder bones. Ostrom concluded that birds did descent from dinosaurs as Huxley had argued.

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Scientists have scoured fossil records to find out one of the greatest mysteries of the “origin of bird”. They have uncovered surprising twists in the evolution of birds from their flightless ancestors. The quest to understand the origin of birds and other animals began in earnest over 150 years ago.

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T-rex was one of the largest carnivorous dinosaurs to ever live. Evidence took from the fossilized feces of T-Rex suggested it even ate fairly large dinosaurs like Edmontosaurus and Triceratops. T-Rex fossils are found in western North America. The Hell Creek Formation in northern Montana is an area that is world-famous for its fossil dinosaur sites.

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Until recently, it was thought the dinosaur T-rex lived only in North America and Asia. Scientists have discovered a hip bone belonging to an ancestor of T-rex in Australia. The new species would have been about one-third to one-quarter the size of T-rex. The bone came from a dinosaur that lived earlier in the Cretaceous period than the T-rex.

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Based on the fossil record, at least five major and global mass extinction events have occurred during the past 542 million years. The Permian-Triassic extinction event, sometimes informally called the Great Dying, was an extinction event that occurred approximately 251 million years ago. It was the Earth’s most severe extinction event, with about 90 percent of all marine species and 70 percent of terrestrial vertebrate species going extinct.

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The World Health Organization has warned that the mosquito-borne virus, which has afflicted people in as many as 70 countries, was “highly likely” to spread across Asia.

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