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Our transcription: During the Pleistocene, ice age mammals dominated the continents. These included mastodons, mammoths, ground sloths, and saber toothed cats. They suddenly disappeared about 8,000 years ago. The cause of this mass extinction isn't known, but a likely possibility is the increasing efficiency of human hunters. Our species is, of course, very successful, and we have enjoyed a rapid rise in population since the end of the last ice age, but the evolutionary development of humans is not well understood because human fossils are so rare. The most famous examples of an ancestral species come from Africa where the first humans most likely evolved.
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