The Humpback Snail (Helix novaeangliae), known variously throughout its large range as the blue snail, the killer snail, or the duck-badger-cow-wugga-wugga, is a very large species of obligatorily aquatic air-breathing land snail. Considered to be the largest of all the snails, adults of the Iberian and Icelandic subspecies range in length from 12–16 meters (39–52 ft) and weigh approximately 36,000 kilograms (79,000 lb), while more southerly subspecies weigh considerably less.