pbrennan101's channel

Patricia Brennan and Diane Kelly are biologists at the University of Massachusetts, Amherst, where they study the evolution of copulatory systems i...

This video shows the eversion of the duck penis in barriers of different shapes, some that mimic the female anatomy, and other that do not. The fe...

High speed video showing the explosive eversion of a duck penis in air. The 20 cm penis everts in a third of a second.