Why Are Hibernacula so important?

Over winter, many of our native mammals ‘power down’ and rest to conserve energy. For some, this is a reduction in activity and tendency towards staying in their shelters. For bats and hedgehogs (and dormice in the south of England) this is a huge physiological change, resulting in a dramatically reduced metabolism, with decreased body temperature, breathing and heart rates. This change is known as hibernation, and is a distinct adaptation to conserve energy.