elephant hide rough skin texture tough wrinkle animals appearance Asian-elephant-subspecies big browsers close color colored colors colour coloured colours communicating connected connecting elephant-hide elephants elephas-maximus-indicus enclosure endangered Females grazers habitat-loss hair hairy heavy herbivore Indian-elelphants intelligent mammal megaherbivores strength strong style textures trunks wrinkled wrinkles wrinkly zoo tusks downpour rain raining Singapore wet