They also have pale pink ischial callosities. They have a fully grown beard, fully developed cheek callosities, and long hair. Geladas also have well developed ischial callosities. The evolutionary purpose of callosities is unknown. The functional purpose of the callosities has not been determined. Male right whales have a higher density of callosities than females. Whale louse infestations are especially evident in right whales, where colonies propagate on their callosities. Each individual has a unique callosities pattern. Male right whales have bigger callosities than female right whales. The primary role of callosities has been considered to be protection against predators. Whale barnacles usually settle on patches of roughened, calcified skin called callosities. Some baboons and all gibbons, though otherwise fur-covered, have characteristic naked callosities on their buttocks. The callosities appear white due to large colonies of cyamids (whale lice). The right whale's callosities appear white due to large colonies of cyamids (whale lice). Unlike true right whales, pygmy rights do not have callosities.