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==Description==
The known [[species]] range from {{convert|0.9|to|6.0|m|ftin|abbr=on}} in length and weigh. Hammerheads live in cold waters and far from the shoreline. {{cvt|3|–|580|kg|lb|abbr=on|sigfig=2}}.<ref>{{cite web| last= Hessing| first= S.| year= 2000| url= http://animaldiversity.ummz.umich.edu/accounts/Sphyrna_tiburo/| title= ''Sphyrna tiburo''| work= Animal Diversity Web| via= animaldiversity.ummz.umich.edu| publisher= University of Michigan Museum of Zoology| access-date= 19 December 2012| archive-date= 29 September 2012| archive-url= https://web.archive.org/web/20120929055832/http://animaldiversity.ummz.umich.edu/accounts/Sphyrna_tiburo/| url-status= live}}</ref><ref name="record">{{cite news |title=Record Hammerhead Pregnant With 55 Pups |url=http://dsc.discovery.com/news/2006/07/24/hammerhead_ani.html?category=earth&guid=20060724100030 |work=Discovery News |agency=[[Associated Press]] |date=1 July 2006 |access-date=18 October 2008 |url-status=dead |archive-url= https://web.archive.org/web/20110622001318/http://dsc.discovery.com/news/2006/07/24/hammerhead_ani.html?category=earth&guid=20060724100030 |archive-date=22 June 2011 }}</ref> One specimen caught off the Florida coast in 1906 weighed over {{convert|680|kg|lb|abbr=on}}.<ref>{{cite web|url= https://chroniclingamerica.loc.gov/lccn/sn83030214/1906-04-15/ed-1/seq-18/print/image_681x581_from_1924%2C0_to_4549%2C2240/|title= Hammerhead Shark Captured in Florida Waters|author= New-York Tribune|date= 15 April 1906|website= Chronicling America|publisher= New-York Tribune|access-date= 20 September 2022|archive-date= 20 September 2022|archive-url= https://web.archive.org/web/20220920201252/https://chroniclingamerica.loc.gov/lccn/sn83030214/1906-04-15/ed-1/seq-18/print/image_681x581_from_1924,0_to_4549,2240/|url-status= live}}</ref> They are usually light gray and have a greenish tint. Their bellies are white, which allows them to blend into the background when viewed from below and sneak up to their prey.<ref>{{cite web| url= http://www.sharks-world.com/hammerhead_shark.html| title= Hammerhead Shark| website= sharks-world.com| date= | publisher= | access-date= 19 December 2012| archive-date= 7 July 2011| archive-url= https://web.archive.org/web/20110707050317/http://www.sharks-world.com/hammerhead_shark.html| url-status= dead}}</ref> Their heads have lateral projections that give them a hammer-like shape. While overall similar, this shape differs somewhat between species; examples are: a distinct T-shape in the [[great hammerhead]], a rounded head with a central notch in the [[scalloped hammerhead]], and an unnotched rounded head in the [[smooth hammerhead]].<ref>{{Cite web|title=Marine Species ID: Great Hammerhead vs. Scalloped and Smooth Hammerhead|url=https://www.sportdiver.com/marine-species-id-great-hammerhead-vs-scalloped-and-smooth-hammerhead|access-date=7 October 2020|website=Sport Diver|language=en|archive-date=8 August 2021|archive-url=https://web.archive.org/web/20210808031143/https://www.sportdiver.com/marine-species-id-great-hammerhead-vs-scalloped-and-smooth-hammerhead|url-status=live}}</ref>
Hammerheads have disproportionately small mouths compared to other shark species.<ref name=":2" /> Some species are also known to form [[Schools of fish|schools]].<ref>{{Cite web |title=Hammerhead shark {{!}} Diet, Size, & Facts {{!}} Britannica |url=https://www.britannica.com/animal/hammerhead-shark |access-date=26 July 2023 |website=www.britannica.com |language=en |archive-date=24 July 2023 |archive-url=https://web.archive.org/web/20230724051000/https://www.britannica.com/animal/hammerhead-shark |url-status=live }}</ref> In the evening, like most other sharks, they become solitary hunters.{{Citation needed|date=July 2023}} ''[[National Geographic Society|National Geographic]]'' explained that hammerheads can be found in warm, tropical waters, but during the summer, they participate in a mass migration to search for cooler waters.<ref name=":1">{{cite web| url= http://animals.nationalgeographic.com/animals/fish/hammerhead-shark/| title= Hammerhead Shark| website= [[National Geographic Society|NationalGeographic.com]]| access-date= 9 November 2016| date= 10 September 2010| archive-date= 10 November 2016| archive-url= https://web.archive.org/web/20161110101800/http://animals.nationalgeographic.com/animals/fish/hammerhead-shark/| url-status= dead}}</ref>
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