Nov 06, 2014 · Here's Why Some Animals Have Two Penises. SCIENCEALERT STAFF. 6 NOV 2014. Scientists in the US have solved one of the biggest mysteries in evolutionary biology - how the penis develops, and why animals such as snakes and lizards have .
Jan 11, 2007 · Best Answer: Iguanas, koalas and Komodo dragons all appear to have two penises. To clarify, though, they have a single penis, but it is split in two (pretty much 'Y'-shaped.) This organ is known as a hemipenes. Snakes also share this interesting feature. Apparently, the Status: Open.
This is one hypothesized reason for males having two penises instead of one: as each hemipenis is associated with one testis and only one side can be used during mating, having a second hemipensis functions as a "backup" and ensures that mating can continue even if one side were to run out of sperm.
A snake will sometimes extrude one when defecating (and that’s the io9 Mental Image of the Day). But for the most part, a snake will keep its hemipenis tucked away inside its cloaca.Author: Esther Inglis-Arkell.