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From two heads to swimming sex parts – here’s the weirdest penises in the animal kingdom

NO penis is exactly the same and in the animal kingdom, the wild variety may shock you.

From spines on cat penises to an octopus's swimming sex parts, we've rounded up some of the weirdest animal privates.

Octopus

This octopus penis swims on its own
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This octopus penis swims on its ownCredit: Julian Finn, Museum Victoria, The Malacological Society of London

The argonaut octopus has a detachable penis.

The floating phallus can swim away and look for a female to mate with.

When scientists first spotted the floating penis they thought it was a parasitic worm.

It took many years to work out that it was actually a penis.

Cat

Cats have penis spines
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Cats have penis spinesCredit: Getty

A lot of our furry feline friends are hiding a spiky secret.

Male cats have penile spines that tear at the female's vagina when removed.

This is said to trigger ovulation and could help a female get pregnant.

Duck

This duck has a penis that's 17 inches long
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This duck has a penis that's 17 inches longCredit: K. McCracken/Nature

The Argentine blue-bill lake duck is a small creature with a huge 17 inch long penis.

A lot of male birds don't actually have penises so this is an even more impressive feat.

The long penis is also shaped like a corkscrew.

Scientists aren't sure why the duck evolved such a large appendage.

Snake

A snake penis has two heads
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A snake penis has two headsCredit: Vida Preciosa International

Snakes have a Y-shaped penis with two heads.

It's not technically two penises it just looks a bit like it.

Only one part of the double phallus is used during mating but snakes are known to alternate each side during the same sexual escapade.

Sea slug 

Sea slugs have tiny penises that break off after sex
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Sea slugs have tiny penises that break off after sexCredit: Lange R, Gerlach T, Beninde J, Werminghausen J, Reichel V, et al

The sea slug may have drawn the short straw when it comes to all the penises in the animal kingdom.

After sex, they shed their penis into the ocean.

The good news is, they have at least two more disposable penises and can start using them a day later.

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