A New Kind Of Birdsong Manakin Bird mating call video Manakin Bird mating call video slow motion Did you know that?
Male duck penises apparently have had to evolve in order to keep up with the female duck vagina and uterus? The inside shape of the females cavity twists in a cork-screw shape and is incredibly long. The male penis twists in the opposite direction and has had to grow in length, on an evolutionary scale, in order to be able to establish successful matings with females.
Have you ever seen a duck penis? Go look. Now. No wonder human females buy dildos with bunny attachments and ticklers, the human male genitals just aren't keeping up. [ this is where I start babbling about Cronenberg and my uterus being all wrong. ]