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which of these animals is extinct

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Quite! "Which of these..." gives us no list from which to pick the right answers. One of the most famous modern extinctions was of the Dodo, a flightless bird killed by hunters in the 19C. Apart from man-made extinctions there have been several massive extinctions throughout geological time, including that which wiped out the dinosaurs some 65Ma (just recently suggested as the culmination of a major series of species deaths over the preceding 50M years). Another, in the Permian Period some 200MA (number of years from memory) was even greater, killing over 90% of life on Earth.

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9y ago

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