Bats will only breathe every few hours, they are huddled together in caves and save a lot of energy but drop their heart rate: from 1000 beats a minute right down to 25!Snails also spend a lot of time sleeping as they hide from hot temperatures in summer, which is called estivation. In winter they eat a lot of food so they can go without new energy intake for as long as three months, lay their eggs and then close up the hole in their shell with a skin they make of chalk and slime, which keeps the moisture inside their shell.
For at least half the year, bees hide in holes in the soil or in a rotten tree. While worker bees and male bees die at the end of summer, the queen bee hibernates and builds a new nest every summer.
Marmots hibernate for three quarters of the year, but others take hibernation to other extremes. Woodchucks' body temperature drops from a normal 36 degrees to 3, just above freezing point. While they still breathe every six minutes, box turtles stop breathing altogether, taking in oxygen only through their skin. They hibernate between 75 and 150 days depending on the subspecies and the climate they live in. In warmer climates, they just slow down their activities, but if they do bury themselves, their heart rate will be reduced to one beat every five to ten minutes.
flickr | Kalle Gustafsson