Once again, some mysterious factor appears to have been at work in bringing about these mass extinctions. With their woolly coats and thick skins, mammoths are generally considered adapted to cold weather, and we are not surprised to come across their remains in Siberia. Harder to explain is the fact that human beings perished alongside them,15 as well as many other animals that in no sense can be described as cold-adapted species: The northern Siberian plains supported vast numbers of rhinoceroses, antelope, horses, bison, and other herbivorous creatures, while a variety of carnivores,
  
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