No penis required. Google “cloacal kiss.” Photo by PWIO via Creative Commons [Photo linked to original] No penis required (Google "cloacal kiss" if you're curious.) Photo by PWIO via Creative Commons

Bird Sex and Why It Matters: My New Column For the New York Times

ByCarl Zimmer
Published June 6, 2013

Check it out!

(And for you anatomy junkies, Ed Yong has more!)