Editing Pygmy sperm whale (section)

==Reproduction==
{{See also|Whale reproduction}}
Although firm details concerning pygmy sperm whale reproduction are limited, they are believed to mate from April to September in the Southern Hemisphere and March to August in the Northern Hemisphere.<ref name=Bloodworth2008/> These whales become sexually mature at age 4-5,<ref name="Ross-2006">{{Cite web |last=Ross |first=Graham J.B. |date=February 2006 |title=Review of the Conservation Status of Australia’s Smaller Whales and Dolphins |url=https://www.agriculture.gov.au/sites/default/files/documents/conservation-smaller-whales-dolphins.pdf}}</ref> and like virtually all mammals, are iteroparous (reproducing many times during their lives). Once a female whale is impregnated, the average gestation period lasts 9–11 months,<ref>{{Cite book |last=Perrin |first=W. F. |url=https://books.google.ca/books/about/Encyclopedia_of_Marine_Mammals.html?hl=it&id=RsEKkDNF5f4C&redir_esc=y |title=Encyclopedia of Marine Mammals |last2=Perrin |first2=William F. |last3=Würsig |first3=Bernd |last4=Thewissen |first4=J. G. M. |date=2002-01-22 |publisher=Gulf Professional Publishing |isbn=978-0-12-551340-1 |pages=1007-1009 |language=en}}</ref> and unusually for [[cetaceans]], the female gives birth to a single calf head-first.<ref name=Huckstadt2001>{{cite journal |author1=Huckstadt, L.A.  |author2=Antezana, T.  |name-list-style=amp | year = 2001 | title = An observation of parturition in a stranded ''Kogia breviceps'' | journal = Marine Mammal Science | volume = 17 | issue = 2 | pages = 362–365 | doi = 10.1111/j.1748-7692.2001.tb01277.x|bibcode=2001MMamS..17..362H }}</ref> Newborn calves are about {{convert|1.2|m}} in length, weighing 50&nbsp;kg, and are [[weaning|weaned]] around one year of age.<ref name=Bloodworth2008/> They are believed to live up to age 23.<ref name="Ross-2006" />