What is Hooded seal?
{{Taxobox | name = Hooded seal<ref name=msw3>{{MSW3 Wozencraft | pages = | id = 14001030}}</ref> | status = VU | status_system = iucn3.1 | status_ref = <ref name=iucn>{{IUCN2008 | assessors = Kovacs, K. | year = 2008 | title = Cystophora cristata | id = 6204 | downloaded = 2009-01-28}}</ref> | image = Klappmuetze MK.jpg | regnum = [[Animal]]ia | phylum = [[Chordate|Chordata]] | classis = [[mammal|Mammalia]] | ordo = [[Carnivora]] | familia = [[Phocidae]] | genus = '''''Cystophora''''' | genus_authority = [[Sven Nilsson|Nilsson]], 1820 | species = '''''C. cristata''''' | binomial = ''Cystophora cristata'' | binomial_authority = ([[Johann Christian Polycarp Erxleben|Erxleben]], 1777) | range_map = Cystophora cristata habitat.png | range_map_caption = Distribution of the hooded seal. Breeding grounds indicated in blue. }} The '''hooded seal''' (''Cystophora cristata'') is an [[arctic]] [[pinniped]]. It is found only in the central and western [[North Atlantic]]. It ranges from [[Svalbard]] in the east to the [[Gulf of St. Lawrence]] in the west. The male has a peculiar [[inflatable]] bladder on the head. This bladder hangs between his eyes and down over his upper lip in the deflated state. In addition, he can inflate a large balloon-like sac from one of his nostrils.<ref>[http://www.drawfluffy.com/hooded-seal.html Hooded Seal (Cystophora cristata), a Weird Animal] {{Webarchive|url=https://web.archive.org/web/20101229183024/http://www.drawfluffy.com/hooded-seal.html |date=2010-12-29 }}. Drawfluffy.com. Retrieved on 2011-09-16.</ref> The bulge develops when the seal is four years old. The male can blow up this bulge, so that it is the size of its head. The hooded seal can live to about age 30 to 35. ==Size== Adult males are {{convert|2.6|m}} long on average, and weigh {{convert|300|-|410|kg|lb|abbr=on}}. Females are much smaller: {{convert|2.03|m}} long and weighing {{convert|145|-|300|kg|lb|abbr=on}}.<ref>[http://marinebio.org/species.asp?id=304 Hooded Seals, Cystophora cristata]. marinebio.org</ref><ref>[http