The vampire squid can grow to about 30 cm (1 foot) in total length. It is no threat to humans. Its 15 cm (6 inch) gelatinous body varies in color between velvety jet-black and 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 inside of this "cloak" is black. Only the distal half (farthest from the body) of the arms have suckers. Its limpid, globular eyes—which appear red or blue, also depending on lighting—are proportionately the largest in the animal kingdom at 2.5 cm (1 inch) in diameter.