Giant squid

Architeuthis dux, the giant squid (Architeuthidae), is the sole valid species of its genus, described by Steenstrup in 1857. Females reach a mantle length of 2.25 m and a total length of 12–13 m with the tentacles, weighing an estimated 275 kg; males measure about 10 m and 150 kg. The eyes, up to 27 cm across, are the largest of any living animal. It is nearly cosmopolitan over continental and island slopes at roughly 300–1000 m. It preys on deep-sea fish and other cephalopods and is a principal prey of sperm whales. IUCN listed it Least Concern in 2014.