bamboo bear-cat black carnivore china endangered giant panda mammal 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 herbivore herbivorous lone mountainous-habitat oriental-bear panda-food ponderous popular protected protection sedentary snacking solitary symbol symbolic unique wallpaper zoo ailuropoda melanoleuca Asian bear breeding programme giant panda bear mountainous habitat oriental bear