7 Lesser-Known Science Facts That Will Leave You Pondering Life - Page 7 of 9

Snorlax

Koalas sleep between 18 and 22 hours. Sleeping this much longer is very unusual for an herbivore and marsupial. They sleep a lot to conserve energy as their diet requires a lot of energy to digest. The eucalyptus leaves they eat contain toxins and are very low in nutrition and high in fibrous matter, so they take a large amount of energy to digest. Sleeping for long periods is a strategy for conserving energy.