Hibernation – Pro Igel | Verein für integrierten Naturschutz Deutschland e. V. https://www.pro-igel.de/hibernation-2/?lang=en
Hedgehogs hibernate to survive the cold months. They are the only insectivore to hibernate. Hedgehogs can spend as long as five months asleep in their round, weatherproof, well insulated nests during winter when food is scarce. They roll up into a tight ball and stay for weeks or months in this position.
houses Hedgehogs’ help Hedgehog conservation (German