Thursday, April 12, 2012

Evolution of Sex(ual organs) Pt. 2

(Don't worry- no graphic pictures included)

In my previous post, we looked at two postulates for the earliest penis fossil records (up to 100~400 mya). Although the idea of males having sexual organs that stick out seems like an evolutionarily plausible and reasonable thing, for some animals, this seems quite extravagant and unnecessary. A specific example of this is birds. Only 3% of the bird species have penises. Knowing that having penis is the minority, the right question we can ask is: why do some birds have penises in the first place, and how are they different?

An article from Nature demystifies this phenomenon through observing ostrich penis.

Most penises become erect by blood vascular system, where the arteries become dilated that draws blood towards the penis. However, ostriches and other ratites, or flightless birds such as kiwis, utilize lymphatic system to achieve this erection. They have paralymphatic bodies below the muscle that cause erections. The origin of lymphatic erection is yet to be determined; however, they are hypothesized to be a result of divergent evolution.

Penises are one of the primary sexual traits, yet birds prove this theory wrong.

Anyone interested in reading the full article or watching an erect ostrich penis, go to the link below:


  1. I read another article about this phenomenon ( and one of the authors of the study mentioned that since the lymphatic system has low pressure, an erection cannot be maintained for an extended period of time. Interestingly, some birds that use the lymph-based mechanism have "explosive" erections, in which the lymph fluid is propelled through the penis to increase pressure briefly.

    I don't know anything about avian copulation, but I wonder if this method of erection is somehow less energetically expensive than utilizing the vascular system.

    1. Am really grateful and thankful for what Dr. Ozman has done for me and my family. i have be suffering from HERPES for good three years with no solution, the diseases almost took my life and because I was unable to work and I was also loosing lots of money for medication, but one faithful day when I went online, I met lots of testimonies about this great man so I decided to give it a try and to God be the glory he did it. If you need his help or you also want to get cured just the way I got mine, just email him : or Whatsapp ;+2349061515609 or as well call +2349061515609 and get your healing. He has cure for other deadly diseases like Herpes, Hiv, Hepatitis,ALS.
      1 cancer cure
      2 diabetes cure
      3 ringing ear
      4 herpes cure
      5 warts cure
      6 HPV cure
      7 fabriod

  2. I think rather than energy expense, this article is trying to show that there must be some phylogenetic connection between reptiles and birds, since reptiles are cold-blooded and birds don't use blood to get an erection. The article states "[this] could have important implications for the understanding of the shared, and divergent, evolutionary heritage of birds and reptiles."

  3. Are then penises, especially ones that use the vascular system, only prevalent among mammals? Also, how much does climate have to do with it? I was reading an article that said that in colder climates, many animals have retractable penises (i.e. the Artic hare) and others don't at all, because it become a freezing liability.

  4. Grateful on how DR James miraculously help me on my penis enlargement which i have suffered for so long and since then i have never witness any form of insult from my woman, before now she always says lot of bad words to me, that i am not a full man, but now she is after sex and it has gotten to a point when i am tired as we have sex from 12AM Till 5AM and still asked for more, but i am very happy that after i meant with DR James my life turned around, if you having issues of quick ejaculation, slow erection problem, and cumming on time. all you have to do is to contact DR James and have your issues resolved for ever and have a happy sex life, with your partner or spouse. because today i am a living testimony of DR James wonder cream action. waste no more time and write to him on his email: or his what app number:+2349055637784

  5. What do you think about this recipe?My name terry, i just want to
    share my testimony with the world on how Doctor udo Help me to enlarge my
    penise. Please read my good news carefully and i am sure it will affect your
    life positively on how you will also enlarge your pines,because i know some
    many people out there also need his help! I came across so many comments
    about Dr udo Penis Enlargement Medicine some weeks ago, though I had
    really wanted my penis to be large, long and thick,because i was not able
    to have sex with my wife..It was really affecting our marriage and my wife
    was about to divorce me. I had about 3.7cm – 3.2 inches before. Am really
    amazed on the fast results archived within 14 days of using Dr udo Penis
    Enlargement Medicine. It work and now I have got 22.87cm – 10.5 inches now. 
    And my wife love it more now, i began to feel the enlargement of my penis,
    This went on for a little period of about 5 days and to my surprise my wife
    keeps screaming that she love my big dick now. And my penis is now 10.5
    inches long on erection and off course very large round. I am very happy
    for this Penis Enlargement experience. Email him 
    Whatsapp or call +2348151972510 PENIS Enlargement, 
    Low sperm count,
    Love spell, 
    Herpes cure,
    HIV cure,
    watering sperm, 
    s.t.d diseases, 
    internal heat rashes,
    low sperm count,
    dairy long 
    sickness kidney, your problem with doctor,Dr udo you are in safe hands your healing is awesome  Email> or whatsapp 
    or SMS.