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. One study (published in 1996) found the mean flaccid penis length to be 3.5 inches (8.9cm) (measured by staff). [3] A review of several studies found average flaccid length to be 9–10cm (3.5–3.9in). [6] Length of the flaccid penis does not necessarily correspond to length of the erect penis; some smaller flaccid penises grow much longer, while some larger flaccid penises grow comparatively less. [7] Male and female emus are similar in appearance, [13] although the male's penis can become visible when he defecates. [14]

England, Gary (15 April 2008). Fertility and Obstetrics in the Horse. John Wiley & Sons. ISBN 978-0-470-75041-4 . Retrieved 18 February 2014. Khanna, Dev Raj; Yadav, P. R. (1 January 2005). Biology Of Mammals. Discovery Publishing House. ISBN 978-81-7141-934-0 . Retrieved 20 July 2013. Michael L. Augee; Brett A. Gooden; Anne Musser (January 2006). Echidna: Extraordinary Egg-laying Mammal. Csiro Publishing. ISBN 978-0-643-09204-4. Archived from the original on 26 March 2014 . Retrieved 23 July 2013.José Roberto Moreira; Katia Maria P.M.B. Ferraz; Emilio A. Herrera (15 August 2012). Capybara: Biology, Use and Conservation of an Exceptional Neotropical Species. Springer. ISBN 978-1-4614-4000-0. Archived from the original on 26 March 2014 . Retrieved 25 July 2013. The researchers also measured the participants’ body mass index (BMI), which increases with obesity. There was a weak correlation between greater BMI and shorter erect penile length when measuring from the skin over the pubic area, but not when measuring from the bone to the tip. Linzey, Donald W. (28 December 2011). Vertebrate Biology. JHU Press. ISBN 978-1-4214-0040-2 . Retrieved 20 July 2013. Likewise, an erect penis of 3.94 inches is in the 5 percentile, meaning that only 5 out of 100 would have a penis shorter than 3.94 inches.

Shultz, N. (26 October 2007). "Exhibitionist spiny anteater reveals bizarre penis". New Scientist. Archived from the original on 22 December 2007 . Retrieved 27 October 2006. Fedigan L, Fedigan LM (1988). Cercopithecus aethiops: a review of field studies. Cambridge (UK): Cambridge University Press. pp.389–411. The penile morphology of some types of strepsirrhine primates has provided information about their taxonomy. [108] Male galago species possess very distinctive penile morphology that can be used to classify species. [109] [110] [111]

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Endangered Wildlife and Plants of the World. Marshall Cavendish. 1 January 2001. pp.1460–. ISBN 978-0-7614-7194-3. Archived from the original on 28 May 2013 . Retrieved 23 January 2013. Limited to no statistically significant correlation between penis size and the size of other body parts has been found in research. Some environmental factors in addition to genetics, such as the presence of endocrine disruptors, can affect penis growth. Shown below are Willy's schedules prioritized highest to lowest. For example, if it is raining, that schedule overrides all others.

Rose, Kenneth D.; Archibald, J. David (22 February 2005). The Rise of Placental Mammals: Origins and Relationships of the Major Extant Clades. JHU Press. ISBN 978-0-8018-8022-3 . Retrieved 22 July 2013. The ol' Man was a fisherman, you know. I grew up sailing between the fern islands, living from catch to catch. The fishing life is tough, but there's something about it that keeps you goin'.” The shaft of your penis extends from the tip to where it connects to your lower belly. It looks like a tube. Your urethra is inside the shaft. In 2015, researchers in Saudi Arabia published a study involving 778 males aged 20–82 years attending a urological clinic. Sometimes, an average-sized penis may appear small due because there is additional skin around it. People may refer to this as a buried penis, and surgery can resolve it.

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da Silva, Vera M. F.; Spinelli, Lucas G. (2023). "Play, Sexual Display, or Just Boredom Relief?". In Würsig, Bernd; Orbach, Dara N. (eds.). Sex in Cetaceans: Morphology, Behavior, and the Evolution of Sexual Strategies. Springer. pp.153–171. ISBN 9783031356506.