animal Australia bear endangered grey koala mammal nature background brown cute green leaf leaves Planckendael sleep sleeping zoo cuddly eucalyptus marsupialTeddy beart arboreal arboreal herbivorous marsupial Australian cultural culture emblem emblematic eyes fauna features fur furry head herbivorous icon iconic image inactive koala bear Marsupial national native nostalgia nostalgic phascolarctos cinereus popular pouched protected protection secure secured slow slow metabolism symbol symbolic wildlife aged image old style fawn fuzzy herbivore natural tree trunk