23. Koalas
Koalas are renowned for their marathon sleeping sessions, often dozing for up to 20 hours a day. This extreme rest is necessary to conserve energy, as their eucalyptus-based diet provides very little nutrition.
Koalas nap while wedged comfortably in the crooks of tree branches, their bodies perfectly adapted for a life among the treetops. Their sleepy lifestyle is an essential survival strategy in Australia’s forests. Australian Koala Foundation