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Male echidnas have FOUR-headed penises but scientists crack breeding in captivity | Daily Mail Online
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An Echidna's Penis Has Four Heads, New Study Reveals How It Works | Mental Floss
So this is how the four-headed penis of an echidna actually works | SYFY WIRE
Solving the mystery of the four-headed echidna penis
Why Do Echidnas Have Four-Headed Penises?
Australian researchers discover why only two of echidna's four penis heads become erect at one time | Australia news | The Guardian
Solving the mystery of the four-headed echidna penis | Pursuit by The University of Melbourne
Scientists unravel mystery of echidnas' bizarre 4-headed penis | Live Science
Echidnas have a unique 4-headed penis but only use half at a time | CBC Radio
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Kamikaze sperm and four-headed penises – the hidden ways animals win the mating game
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Meet the world's weirdest creature with a four-headed penis and spikes on its tongue - Mirror Online
Apparently echidnas have four-headed penises... : r/WTF
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Solving the mystery of the four-headed echidna penis | Pursuit by The University of Melbourne
Four-headed echidna penises under the microscope for Queensland captive breeding program - ABC News
1 shaft, 4 heads: The echidna's penis. | Pygmy Loris
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
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Today I Learned: The echidna has four penis heads. : r/todayilearned