The Hoary bat, Silver-haired bat and Red bat are the only Okanagan migratory bats going out of the country. It is thought that other bats travel less than 50 kilometres to winter hibernation caves or rock crevices. Heading off to winter hibernation sites, mature bats will socialize and mate before going to sleep for six or more months. During hibernation their heart rate may slow to 5 beats per minute, they lose up to forty percent of their body weight, and their temperature may be only slightly greater than the surrounding air. Hibernation sites have high humidity and a temperature that stays above 4o Celsius. People are advised not to go into caves where bats are hibernating to prevent the bats from using precious energy trying to escape.