Male Echidnas have a four-headed penis?! - YouTube
Australian researchers discover why only two of echidna's four penis heads become erect at one time | Australia news | The Guardian
Echidna's Male Organ has Four Heads - YouTube
Five weird things about platypuses and echidnas - ABC News
Solving the mystery of the four-headed echidna penis | Pursuit by The University of Melbourne
Echidnas have a unique 4-headed penis but only use half at a time | CBC Radio
Echidna penises: Why they're so weird - Australian Geographic
AUSSIE SAVANTS UNRAVEL MYSTERY OF THE 4-HEADED ECHIDNA PENIS
Emily Willingham, PhD - #PenisPerDiem 2: meet the echidna. It looks built by committee, as monotremes do, and its penis is no exception. A four-part glans (tip) makes this entry outstanding in
Echidna penises: Why they're so weird - Australian Geographic
Male echidnas have FOUR-headed penises but scientists crack breeding in captivity | Daily Mail Online
Clintos on Twitter: "Yes, I have seen the Echidna's Penis thanks to National GeoGRAPHIC!" / Twitter
What if you had a 4-Headed Penis like the Echidna? Do you want a Giant Electric Blue Penis like the Leopard Slug? Here's some of the Weirder Penises in the animal kingdom -