Madrid, Spain. 06th Sep, 2017. Mayra, a 7 years-old female of Koala pictured resting in her enclosure at Madrid zoo. Because the eucalyptus diet has limited nutritional and caloric content, koalas (Phascolarctos cinereus) are largely sedentary and sleep for up to 20 hours a day. Credit: Jorge Sanz/Pacific Press/Alamy Live News

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Keywords: cinereus, enclosure, koala, phascolarctos, resting, sleep, zoo