Thick folds on either side of the neck that hang down into a loose hood shape. When the leech is full, they become dense, flaring out like a cobra.
Popular among collectors and as desert mounts, the cobra neck is often owned by an exquisitely patterned leech. They are considered a symbol of prosperity in certain circles.
If the leech overfeeds, however, it looks extremely undignified; appearance-focused owners will do their utmost to ensure a balanced diet with no extra snacks.