What is Colossal squid?
{{Taxobox | name = Colossal squid | image = Calmarcolossal.jpg | image_width = 150px | image_caption = Size comparison against an average [[human]] | regnum = [[Animal]]ia | phylum = [[Mollusc]]a | classis = [[Cephalopod]]a | ordo = [[Teuthida]] | genus = | species = | binomial = ''Mesonychoteuthis hamiltoni'' | binomial_authority = [[Carolus Linnaeus|Linnaeus]], 1758 | range_map = Mesonychoteuthis map.svg | range_map_caption = Global range of ''M. hamiltoni''}} The '''colossal squid''', ''Mesonychoteuthis hamiltoni'', is the biggest [[squid]] in the world, 9–10 [[metre]]s (30–33 [[Foot (unit of length)|feet]]) long.<ref>Roper, C.F.E. & P. Jereb (2010). Family Cranchiidae. In: P. Jereb & C.F.E. Roper (eds.) ''[http://www.fao.org/docrep/014/i1920e/i1920e00.htm Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 2. Myopsid and Oegopsid Squids]''. FAO Species Catalogue for Fishery Purposes No. 4, Vol. 2. FAO, Rome. pp.&nbsp;148–178.</ref> The colossal squid is bigger than a [[giant squid]]. Its body is reddish brown and it lives up to 2000m below the surface of the [[Southern Ocean]]. It is the main food eaten by [[Sperm Whale|sperm whales]]. The colossal squid has [[ammonium chloride]] in its body, so it tastes bad for humans. It is believed to feed on prey such as [[chaetognatha]], large [[fish]] like the [[Patagonian toothfish]] and other [[squid]] in the deep [[ocean]] using [[bioluminescence]]. The colossal squid is thought to have a slow [[Metabolism|metabolic rate]], requiring only around 30&nbsp;g of prey daily.<ref name=slow>Rosa R. & B.A. Seibel 2010. Slow pace of life of the Antarctic colossal squid. ''Journal of the Marine Biological Association of the United Kingdom'', published online 20 April 2010. [http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=7911364 Cambridge Journals Online - Abstract]</ref