animal Bengal-tiger-variant big-cat breeding carnivore color colored colorful colors colour coloured colourful colours conservation contrast critically-endangered distinct distinctive felid hunter mammal movement moving pacing panthera-tigris protected protective prowling reclining rehabilitation relaxed relaxing resting Singapore-zoo striped sub-species swimmer tiger white white-tigers wildlife zoo Australian brown creature Dirt earth ground kangaroo macropus Marsupial nature paw standing black Camouflage camouflaged panthera-tigris-sumatrae Perth-zoo small smallest-tiger solitary Sumatran-tiger white-bearded african drink eat elephant elephants feed food huge hungry skin trunk walk Diceros bicornis ear head horn natural nostril rhino rhinoceros snout alone animals ape monkey arrested cage lonely primate prisoner saguins samir