Koalas primarily live in eastern Australia and have the scientific name Phascolarctos, meaning "pouch bear". They mainly eat eucalyptus leaves and average 9-20 lbs, measuring 27-36 inches. Female koalas carry their young, called joeys, in their pouch for around 5 months after a 35 day pregnancy. Koalas sleep for much of the day to conserve energy and move between trees by jumping or swimming.