Dixson, Alan F. (26 January 2012). Primate Sexuality: Comparative Studies of the Prosimians, Monkeys, Apes, and Humans. Oxford University Press. ISBN 978-0-19-150342-9. Archived from the original on 31 December 2013 . Retrieved 6 September 2013.

Debra Lee Miller (19 April 2016). Reproductive Biology and Phylogeny of Cetacea: Whales, Porpoises and Dolphins. CRC Press. pp.133–. ISBN 978-1-4398-4257-7. Archived from the original on 20 March 2018. Jay Houston (2008-07-07). Ultimate Elk Hunting: Strategies, Techniques & Methods. Cool Springs Press. ISBN 9781616732813. Archived from the original on 2013-05-11 . Retrieved 2013-02-10.Macdonald, D.W., ed. (2009). The Princeton Encyclopedia of Mammals. Princeton University Press. ISBN 978-0-691-14069-8. Dolphins don’t just use their penises for baby-making, either. Bottlenose dolphins frequently copulate for pleasure, and often with members of the same sex. Dolphin sex doesn’t last long, only about ten seconds, but males can ejaculate multiple times an hour. Fencing With a Phallus

a b William O. Reece (2009-03-04). Functional Anatomy and Physiology of Domestic Animals. John Wiley & Sons. ISBN 9780813814513. Archived from the original on 2018-03-20. We have sequenced the mitochondrial genome from one of the skulls of an elephant from Puntali cave in Sicily,' explains Victoria. 'This is amazing, because up to now there has been no DNA evidence at all from any of the southern European population of straight-tusked elephants. We've only had ancient DNA from German specimens.' Dolphins are known for their intelligence, promiscuity and absurdly dexterous penises. They have a prehensile penis, meaning it can swivel, grab and grope, much like a human hand. A prehensile penis helps males navigate the complex, labyrinth-like reproductive tracts of female dolphins.

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It is thought that the dwarfing process at the earliest began once the Puntali elephant diverged from its mainland relative.