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The giant squid (Architeuthis dux, pictured) was for a long time thought to be the largest extant cephalopod. It is now known that the colossal squid (Mesonychoteuthis hamiltoni) attains an even greater maximum size. The giant squid seen here measured 9.24 m (30.3 ft) in total length and had a mantle length of 1.79 m (5.9 ft).
The known predators of adult giant squid include sperm whales, pilot whales, [35] [36] southern sleeper sharks, [37] and in some regions killer whales. [38] Juveniles may fall prey to other large deep sea predators. Because sperm whales are skilled at locating giant squid, scientists have tried to observe them to study the squid.
A piece of sperm whale skin with giant squid sucker scars. Sperm whales usually dive between 300 and 800 metres (980 and 2,620 ft), and sometimes 1 to 2 kilometres (3,300 to 6,600 ft), in search of food. [157] Such dives can last more than an hour. [157]
The giant squid nevertheless remains a rarely encountered animal, especially considering its wide distribution and large size, [60] with Richard Ellis writing that "each giant squid that washes up or is taken from the stomach of a sperm whale is still an occasion for a teuthological celebration".
The giant squid also exhibits abyssal gigantism, but the colossal squid is heavier. [29] Although it is unclear what the maximum weight for colossal squids is, analysis of squid beak dimensions from sperm whale stomachs provided estimates that colossal squids may weigh up to 700 kg or 1,500 lb. [5] [6]
Marine Patch says that they can dive 2,000 meters, or about 6,200 feet for up to two hours while hunting giant squid, sharks, skates, and fish. "Squid just so happens to be the sperm whales ...
Toothed whales range in size from the 1.4 m (4 ft 7 in) and 54 kg (119 lb) vaquita to the 20 m (66 ft) and 100 t (98 long tons; 110 short tons) sperm whale. Several species of odontocetes exhibit sexual dimorphism , in that there are size or other morphological differences between females and males.
The egg size can range from 0.75 to 0.9 mm, and the hatchling size has a mantle length of approximately 1.0 mm. [6] Purpleback squids are among the fastest-growing squid species, as the daily increase of overall length in the dwarf and middle-sized forms is about 1.0 mm; for the giant form, it is about 3.8 mm. [ 6 ]