dicerorhinus sumatrensis sumatra rhino hair endangered mammal rare hairy red brown orange two horned solitary hoof jungle hooves docile intelligent peaceful cute pretty beautiful stout heavy strong herbivore vocal wildlife zoology creature animal fauna species specimen organism di cero rhinos rhinocerotidae borneo malaysia emmy tractable rmvera ungulate hoofstock captive powerful strong smart horn keratin fold large big gray grey green grass tough - Alamy