Banna woman wearing a necklace known as a bignere, a metal band with a phallic protuberance to signify she is a first wife, at the weekly market, Key Afir, Lower Omo Valley, Ethiopia, Africa
A look at the bump-like knobs known as tubercles on the top of the head of a Humpback whale (Megaptera novaeangliae). Each protuberance contains at least one stiff hair. The purpose of these hairs is not known, though they may provide the whale with a sense of 'touch', Hawaii, United States of America
Machu Picchu a house showing construction details, especially stone protuberances used for tying down thatch roofs, Highlands, Peru
