The coloring depends on the species, e.g., the maned sloth’s fur is light-brown, its hair on the neck is black and falls on the shoulders. Three-toed sloth has a grey fur, brown of the sides, and a lighter spot between the shoulder blades (speculum), and a darker pattern in the middle, which helps distinguish females from males. There is a secretory gland in this area, which probably bears high importance during mating.
