Talk:Cloaca

message: "serves as the only opening for the digestive, ... tracts"
Most digestive tracts have two openings, an entrance and an exit. CLandau (talk) 17:22, 7 September 2023 (UTC)
thread_title: Only opening?

message: The inclusion of information about avian reproductive systems seems out of place in this article as well as inaccurate. (Birds do not regrow their reproductive systems prior to mating season; their genitals (testes/ova) enlarge from several hundred to a thousand times in size prior to mating season and revert thereafter.) Redtailed 11:09, 23 September 2006 (UTC)
replies: text: It seems the language has been changed to re-engorged, following your suggestion, but the term 'regeneration' still exists which could still be a bit misleading. I think 'regenerate' would refer to the sex cells (ovaries?) which are regrown when the organs swell prior to the mating season. Tyciol (talk) 19:39, 6 January 2009 (UTC)
thread_title: Reproductive system

message: No bird species have a penis. Some have a phallus, which is a pseudo-penis. -Unsigned
:Like a hyena? It looks like the article reflects this now. Tyciol (talk) 19:39, 6 January 2009 (UTC)
thread_title: Phallus

message: Australian marsupials have a cloaca, right? --Josh 8:14pm (GMT+10)
:For those that do, I expect it would be mentioned on the respectiv species' article. If that can be found, then it can be mentioned here. Judging by the comment below, Jedmichael agrees with you. Tyciol (talk) 19:39, 6 January 2009 (UTC)
thread_title: Marsupials

message: The monotremes and marsupials have one external opening: the cloaca; the intestines and urethra empty into the birth canal. Most placental mammals have two openings: an anus and a "vagina." For them, the urethra comes to its terminus inside the birth canal. Only primates have a urethral opening that can be considered external in females, giving them (us) three openings. Jedmichael 19:40, 29 December 2006 (UTC)
replies: text: That's pretty cool, I didn't know that primates were so unique in this. Tyciol (talk) 19:39, 6 January 2009 (UTC)
thread_title: External openings

message: So do animals with cloaca poop eggs out their butt, essentially? That isn't made clear. -Unsigned
:Based on Jed's summary above, it's not really a 'butt' (though it looks most like one IMO) but it's more like... the large intestine/omb/bladder are the same thing? Tyciol (talk) 19:39, 6 January 2009 (UTC)
thread_title: Eggs

message: "Marsupials and monotremes also possess one (in marsupials and a few birds, the genital tract is separate)."
This sentence seems a bit contradictory. Marsupials can't have both a cloaca and separate urinary and genital tracts. Perhaps somebody who is more knowledgeable about the subject can work on this? 206.21.160.136 (talk) 19:13, 4 February 2008 (UTC)
replies: text: Maybe this refers to a cloaca in which the urinary/digestive system have the same tract but the genital tract is separae? I think the cloaca term covers both 2 and 3 in one. Tyciol (talk) 19:39, 6 January 2009 (UTC)
thread_title: Clarification

message: The last paragraph of this article talks about the cloaca of sea cucumbers.
If echinoderms indeed do have a cloaca, I feel this should be mentioned in the introduction.
Also, the article doesn't clarify the relationship between the echinoderm and amphibian/reptilian/avian cloaca ... are they homologous or just functionally similar?  —Preceding unsigned comment added by TwirlySocrates (talk • contribs) 14:01, 23 August 2010 (UTC)
thread_title:  Echinoderms? 

message: Tenrecs apparently have cloacas despite being placental mammals.  This contradicts the assertion that "Adult placental mammals have no remaining trace of the cloaca".  —Preceding unsigned comment added by 70.166.149.77 (talk) 17:43, 23 August 2010 (UTC)
thread_title:  Tenrecs? 

message: Beavers also have cloacas.  Beavers are placental mammals.216.214.96.110 (talk) 20:47, 24 August 2011 (UTC)
replies: text: My recollection is that beavers don't have a cloaca; among placental mammals, only tenrecs/golden moles do. Where did you read that beavers have a cloaca?--Solomonfromfinland (talk) 22:31, 13 October 2015 (UTC)

text: Has shown in this dissection, they have a cloaca. Should be added to the page and the beaver page.24.122.192.140 (talk) 21:44, 12 November 2017 (UTC)
replies: text:  I was watching this same video and that struck me as odd. A quick search reveals numerous seemingly trustworthy sources making the same claim (https://www.hcn.org/articles/how-do-you-sex-a-beaver-squeeze-and-sniff, https://blog.ncascades.org/graduate-med-program/giving-a-dam-beavers/, ftp://mymontanalibrary.org/Maxell/Beaver/Svendson,%20G.E.%20%201978.%20%20Castor%20and%20anal%20glands%20of%20beaver%20(Castor%20canadensis).%20%20Journal%20of%20Mammalogy.pdf ). I've started a discussion in Talk:Beaver about this, as Beaver doesn't contain any mention of this, despite it's clear notability if it's true. Arathald (talk) 07:01, 15 June 2019 (UTC)
thread_title:  Beavers? 

message: The article says one hole, but :File:Avian_cloaca.jpg seems to show two! Red on the left, blue on the right. Jidanni (talk) 13:12, 14 July 2012 (UTC)
thread_title:  Two holes? 

message: One question I’ve been wondering about is, what are the evolutionary advantages/ disadvantages of a cloaca as opposed to two or three openings? That is, why has the cloaca developed and disappeared several times in vertebrate history? (I.e. why sharks, amphibians, reptiles [incl. birds], monotreme mammals, and tenrecs/golden moles have a cloaca, but ray-finned fishes and most mammals don’t.) I tried to look up information online about the matter, but I couldn’t find anything useful. Could someone please do some research and add some information to this article, about possible reasons why, in animal evolution, the cloaca may appear or disappear?--Solomonfromfinland (talk) 22:29, 13 October 2015 (UTC)
thread_title:  Evolution 

message: As I recall from school in South Africa, some places use the pronunciation “Klo-ah-ka”. But it’s been a few decades. I’m not sure how widespread that is, or if it’s still in use in some variants of English, but if it is, then the pronunciation should be included. Park3r (talk) 21:35, 2 January 2023 (UTC)
thread_title: Pronunciation

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Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 12:53, 3 March 2023 (UTC)
thread_title:  A Commons file used on this page or its Wikidata item has been nominated for deletion 

message: I've failed to find anywhere that says so definitively but in animals like the Tenrec that have cloaca but their more distant relatives don't, does this mean Tenrecs reevolved a cloaca, or does this mean all the Tenrecs distant relatives had one then evolved to not have one?  This is frustratingly hard to find evidence for one way or the other.  Hammerfrog (talk) 08:56, 15 April 2023 (UTC)
thread_title:  Reevolved feature?