The African big five - Lion, African Elephant, Cape Buffalo, Rhinoceros and Leopard - are neither the biggest animals in Africa nor the continent's most endangered species. The Big Five, a phrase thought up by trophy hunters, refers to the five most difficult African animals to hunt on foot. And while these animals are among Africa's most ferocious - they strike back at huntsman with claw, tooth, horn and foot - they aren't the only dangerous animals on the Black Continent. The hippopotamus, African crocodile and mosquito kill more people each year.