Scientists have discovered a dinosaur's tooth along Kakanaut River of northwestern Russia ,a find that shows dinos once lived above the Arctic Circle.Dinosaurs became extinct 65 million years ago when a big meteor crash set off volcanoes.The scientists say that the dinosaurs above the Arctic werenot lost wanderers.The fossils include dinosaur's eggshells a first at high latitudes and evidence of a settled breeding population.The size and shape of fossilized leaves found with the bones enabled scientists team to estimate a mean annual temperature of 50F with winter time lows at freezing.
