The echidna penis has four heads, but only two seem to work at a time. The anatomy is real, and the evolutionary logic is even stranger. #Echidna #Biology #Science
The short-beaked echidna penis has four rosette-like heads, but only two appear to function at once during mating, acting less like four separate tips and more like a quadrifurcate sperm-delivery organ built to channel semen in bundled streams, according to anatomical work on Tachyglossus aculeatus and earlier reproductive studies on echidnas (PubMed anatomy paper; PMC reproduction paper…
