The vampire squid can reach a maximum total length around 30 cm (1 ft). Its 15-cm (6-in) gelatinous body varies in colour from velvety jet-black to pale reddish, depending on location and lighting conditions. A webbing of skin connects its eight arms, each lined with rows of fleshy spines or cirri; the inner side of this “cloak” is black. Only the distal halves (farthest from the body) of the arms have suckers. Its limpid, globular eyes, which appear red or blue, depending on lighting, are proportionately the largest in the animal kingdom at 2. 5 cm (1 in) in diameter. The name of the animal was inspired by its dark colour, cloaklike webbing, and red eyes, rather than habit—it feeds on detritus, not blood.