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Many animals for the winter. They up on food and hide away in a hole or cave to the snow and cold. Scientists now early human beings may have hibernated too. The scientists looked at the fossils of bones from our early ancestors who around 430,000 years ago. The bones were in a site in the north of Spain. The scientists are experts in fossils and ancient bones. They say that the cuts and other signs of damage on the bones they are similar to those on bones of animals who hibernate, like bears. They also that early humans may have hibernated to escape the extreme cold. Winters much colder hundreds of thousands of years ago.

The scientists at the bones of several dozen humans. Scientist Antonis Bartsiokas said there evidence that early humans slowed down their metabolism so they could longer in winter without food. However, humans could not their metabolism like a bear. Bears can wake up after months of hibernation and their body will the same as when they into hibernation. The bones of the early humans people suffered health problems because of hibernation. Many of the problems were by a lack of vitamin D, which we get from sunlight. This can our bones weaker. The researchers said: "We have to that hibernations are not always healthy."