Years of the Elephant

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Fedigan L, Fedigan LM (1988). Cercopithecus aethiops: a review of field studies. Cambridge (UK): Cambridge University Press. pp.389–411.

It shows that the Puntali elephants were isolated on Sicily at least 175,500 years ago, but potentially as recently as 50,000 years ago. In giant anteaters, the (retracted) penis and testes are located internally between the rectum and urinary bladder. [136] Julian Lombardi (1998). Comparative Vertebrate Reproduction. Springer. ISBN 978-0-7923-8336-9. Archived from the original on 26 March 2014 . Retrieved 5 December 2012.Riedelsheimer, B., Unterberger, P., Künzle, H. and U. Welsch. 2007. Histological study of the cloacal region and associated structures in the hedgehog tenrec Echinops telfairi. Mammalian Biology 72(6): 330-341. An erection is the stiffening and rising of the penis, which occurs during sexual arousal, though it can also happen in non-sexual situations. Ejaculation is the ejecting of semen from the penis and is usually accompanied by orgasm. A series of muscular contractions delivers semen, containing male gametes known as sperm cells or spermatozoa, from the penis. Because of their insular and isolated environments, evolution on islands is a process which can lead to a variety of extreme changes in a short timeframe, including dwarfism and gigantism and is often referred to as ‘evolution in action’. To put the extent of the size reduction of the dwarf elephant into context, it would be comparable to modern humans dwarfing to approximately the size of a Rhesus monkey. Schmitt, V.; Anthes, N.; Michiels, N. K. (2007). "Mating behaviour in the sea slug Elysia timida (Opisthobranchia, Sacoglossa): hypodermic injection, sperm transfer and balanced reciprocity". Frontiers in Zoology. 4: 17. doi: 10.1186/1742-9994-4-17. PMC 1934903. PMID 17610714. Dr Johanna Paijmans, a research fellow in the Department of Zoology at the University of Cambridge, said: “This is a really exciting example of the power of multidisciplinary studies. Only through combining multiple lines of evidence we were able to gain a better understanding of the dwarfing process of this iconic species.”

Equine Research (2004). Horse Conformation: Structure, Soundness, and Performance. Lyons Press. ISBN 978-1-59228-487-0. Archived from the original on 7 July 2014 . Retrieved 23 July 2013. Larry Vogelnest; Rupert Woods (18 August 2008). Medicine of Australian Mammals. Csiro Publishing. ISBN 978-0-643-09928-9. Archived from the original on 26 March 2014 . Retrieved 23 July 2013.

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Peter J Chenoweth; Steven Lorton (30 April 2014). Animal Andrology: Theories and Applications. CABI. ISBN 978-1-78064-316-8. Hooper, E.T.; Musser, G.G. (1964). "The glans penis in Neotropical cricetines (Family Muridae) with comments on classification of muroid rodents". Miscellaneous Publications of the University of Michigan Museum of Zoology. 123: 1–57. hdl: 2027.42/56367.

Stallions (male horses) have a vascular penis. When non-erect, it is quite flaccid and contained within the prepuce (foreskin, or sheath). You just need to go look that one up,” says Willingham. You can see a video of the slugs in action here. Roze, Uldis (2009). The North American Porcupine. Cornell University Press. ISBN 978-0-8014-4646-7 . Retrieved 25 July 2013.

It is known from excavation records that dwarf elephants were found in at least two different stratigraphical layers, but it is unclear which layer the skull came from which yielded the ancient DNA sequence. Berezow, Alex B. (March 2, 2015). "Is Your Penis Normal? There's a Chart for That". RealClearScience.com. RealClearScience . Retrieved April 12, 2019. Reena Mathur (2009). Animal Behaviour 3/e. Rastogi Publications. ISBN 978-81-7133-747-7. Archived from the original on 26 March 2014 . Retrieved 23 July 2013. The blue whale might have the world’s biggest penis, but size is relative. Barnacles have the biggest penis-to-body size ratio, with genitalia nearly eight-times their total body length. Wikimedia Commons has media related to Human penis. Penis of a human, with pubic hair removed to show anatomical detail