One‐Sided Ejaculation of Echidna Sperm Bundles | The American Naturalist: Vol 170, No 6
Colin Christian on Twitter: "Echidnas are Monotremes,one of two mammals that lay eggs. They also have a four headed penis. Look at that smile! https://t.co/pLAweboNN3" / Twitter
Echidnas have a unique 4-headed penis but only use half at a time | CBC Radio
Solving the mystery of the four-headed echidna penis | Pursuit by The University of Melbourne
A Baby Echidna. Did you know Echidna's have a four headed penis and no nipples? (More info in the comments) : r/ecology
The Creature Feature: 10 Fun Facts About the Echidna | WIRED
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 -
Did you know an echidna has a four-headed penis? Now you know... - 9GAG
Echidna penises: Why they're so weird - Australian Geographic
Australian researchers discover why only two of echidna's four penis heads become erect at one time | Australia news | The Guardian
CVE on Twitter: "Scientists unravel mystery of echidnas' bizarre 4-headed penis by creating an advanced 3D model of the peculiar organ. Their sperm have the astonishing ability of being able to work
1 shaft, 4 heads: The echidna's penis. | Pygmy Loris
Mental Floss on Instagram: “Most of the time, an echidna's penis is tucked safely inside its body, keeping itself clean and leaving unsuspecting passersby to assume it…”
Meet the world's weirdest creature with a four-headed penis and spikes on its tongue - Mirror Online
Echidnas' 'bizarre' mating no longer obstacle to successful breeding program | Animal welfare | The Guardian
Solving the mystery of the four-headed echidna penis | Pursuit by The University of Melbourne
It Turns Out Echidnas Have Massive Dicks And Cum Out Of Two Holes
Awesome Animal - Long-beaked Echidna - Stan C. Smith
Male echidnas have FOUR-headed penises but scientists crack breeding in captivity | Daily Mail Online
What Animal Has a 4-Headed Penis and Produces Puggles? - Light To Light Transfers
The Creature Feature: 10 Fun Facts About the Echidna | WIRED
Nine of the Weirdest Penises in the Animal Kingdom | Science | Smithsonian Magazine
Echidna - Wikipedia
Four-headed echidna penises under the microscope for Queensland captive breeding program - ABC News
