Early humans may have hibernated in winter
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Animals hibernate for the winter. They escape the cold in a hole. Perhaps early humans did this too. Winters were much colder hundreds of thousands of years ago. Scientists looked at bones from humans from 430,000 years ago. Cuts and other damage on the bones were like those on the bones of animals who hibernate.
Early humans slowed down their bodies in winter so they could survive longer without food. They could not do this like a bear. Bears can sleep for months. Hibernating gave early humans health problems. Many of these were because of not enough vitamin D from sunlight. This made their bones weaker.
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