This strikingly beautiful bird, the Yellow-billed oxpecker, has long been thought to live in symbiosis with large mammals such as giraffes, zebras, buffalo and various deer. It does indeed pick ticks and other parasites from these host animals. However, recent research has shown that it could also be classified as a parasite, as it will widen old wounds, and even gnaw open new ones, to access the blood that is an important part of its diet...