birdoptera

physiology

  • four times the fun?

    Reference: Johnston, S.D., Smith, B., Pyne, M., Stenzel, D. and Holt, W.V., 2007. One-sided ejaculation of…

  • Always erect

    Reference: edyong209, 2013. Alligator penis surprise. SERIOUSLY WATCH THIS! Youtube. Attributed to Brandon Moore. Kelly, D.A.,…

  • Twice the fun

    Reference: Keogh, J.S., 1999. Evolutionary implications of hemipenial morphology in the terrestrial Australian elapid snakes. Zoological…

  • OSTRICH

    Ostriches evert (turn inside out and inflate) their penises both to have sex and to poop.…