animal animals china herbivore lesser panda mammal panda pandas red red panda zoo bamboo bear-cat black carnivore endangered giant panda Sichuan Tibet vegetarian white wildlife WWF ailuropoda-melanoleuca Asian-bear bamboo-eater bear black and white breeding-programme captive captivity chinese conservation distinctive distinguished eating emblem emblematic food giant-panda giant-panda-bear habitat herbivorous lone mountainous-habitat oriental-bear panda-food ponderous popular protected protection sedentary snacking solitary symbol symbolic unique wallpaper