The echidna is an odd animal for many reasons. It looks like a cross between a hedgehog, a platypus and an anteater (and indeed it is commonly known as the “spiny anteater”). Additionally, the females of this mamalian species lay eggs, which is really rare – in fact, the only other mammal known to do this is the platypus (egg-laying mammals are called monotremes), so already we can see that these are special ickly cuties. But what is perhaps most bizarre about this little Australian waddler is its four-headed penis.
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