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The Colossal Squid (Mesonychoteuthis hamiltoni), sometimes called the Antarctic or Giant Cranch Squid, is believed to be the largest squid species. It is the only member of the genus Mesonychoteuthis. Though it is known from only a few specimens, current estimates put its maximum size at 12–14 metres (39–46 feet) long, based on analysis of smaller and immature specimens, making it the largest known invertebrate.Unlike the giant squid, whose tentacles are equipped with suckers lined with small teeth, the suckers at the tips of the Colossal Squid's tentacles have sharp swiveling hooks. Its body is wider and stouter, and therefore heavier, than that of the giant squid. Colossal Squids are believed to have a longer mantle than giant squids, although their tentacles are shorter.The beak of Mesonychoteuthis hamiltoni is the largest known of any squid, exceeding that of Architeuthis in size and robustness. The Colossal Squid is also believed to have the largest eyes in the animal kingdom (even larger than those of giant squid).