animal big-cat breeding carnivore color colored colorful colors colour coloured colourful colours conservation contrast critically-endangered felid hunter mammal reclining rehabilitation relaxed relaxing resting striped sub-species swimmer tiger white white-tigers wildlife zoo black brown Camouflage camouflaged panthera-tigris-sumatrae Perth-zoo small smallest-tiger solitary Sumatran-tiger white-bearded Bengal-tiger-variant distinct distinctive movement moving pacing panthera-tigris protected protective prowling Singapore-zoo beak bird eye flight head high large Saddle-billed span stork wings yellow