two giraffes, one with papillomavirus warts, eating bones to obtain calcium.

dietary elements minerals wild bush park nature african clear patch clearing behavior bending blotches calcium conservation eating bones ecology environment game reserve giraffa giraffes grass habitat herbivores herd irritating kruger national long neck people ossicones papillomavirus patches phosphorous sad safari skin lesions south africa spots survival tallest thorn veld tourism travel virus warts wildlife herbivore