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BIOLOGY:
- ANATOMY -
EXTERNAL ANATOMY (page 10)
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The External Anatomy of the Thylacine

Tail (continued):

    Some illustrations and photographs of the thylacine give the impression of the stripe pattern continuing down the length of the tail.  However, this is actually an effect of light and shadow across the individual joints of the tail when viewed from certain angles, and is not due to pigment.  These "pseudo-stripes" are only seen in photographs of living thylacines, and are not present in preserved specimens such as taxidermies, unless painted on by hand.  Body fat is stored in the tail, and when these fat deposits are depleted, the tail vertebrae become evident, giving the illusion of light stripes.

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pseudo-stripes visible on the tail of a thylacine at the London Zoo (1914)
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"Pseudo-stripes" visible on the tail of a thylacine at the London Zoo, 1914.  Other photos of this individual: 1, 2, 3, 4.  Courtesy: Zoological Society of London.
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    The sex of a thylacine can occasionally be determined by close examination of the lower root of the tail.  In adult males, the lower root of the tail is thickened to accommodate the penis; this thickening is naturally not found in the females.
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last known captive thylacine - Beaumaris Zoo (QD), Hobart (1933)
London Zoo's last female thylacine
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Thickening of the lower root of tail in a male thylacine (left) in comparison to that of a female (right).
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Last captive thylacine - Beaumaris Zoo (QD), Hobart (1933).
Photo courtesy: David Fleay Trustees.
London Zoo's last female thylacine.
Photo courtesy: Zoological Society of London.
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juvenile female thylacine at the London Zoo (1909)
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A juvenile male thylacine at the London Zoo in 1910, displaying an erect tail crest.  Image courtesy: Zoological Society of London.  Another photo of this individual is shown here.
    The thylacine's erect tail probably has both a communicative and an olfactory role.  Cunningham (1882) states that the area around the male's anus is highly glandular, and it would seem logical that these numerous glands have some pheromonal role.  The end of the thylacine's tail has a small, erectile crest near the tip.  Thomas (1888) makes reference to the crest: "The tail is only rather thinly haired, except at the base, and bears a dark tip and a very slight crest above and below".  The crest is shown in its erect state in Hans J. Kull's 1843 illustration of the thylacine.

    Michael Sharland (1941) in an article in the Bulletin, a publication of the New York Zoological Society, states:

    "Its most peculiar feature is the tail. This is carried in a stiff, drooping fashion, and merges gradually with the body with a greatly thickened base, which prevents the animal wagging it as a dog can wag its tail. It is inflexible and would seem to be a hindrance".
 

erectile crest at the end of the thylacine's tail
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Erectile crest at the end of the thylacine's tail.  University of Liege taxidermy specimen RE2810.
Source: International Thylacine Specimen Database, 5th Revision 2013.
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References
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back to: External Anatomy (page 9) return to the subsection's introduction forward to: Internal Anatomy (page 1)


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