This Fish Hides for Safety in a Sea Cucumber's Rectum... Yep.

Meet the sea cucumber!

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BBC Two's Natural World explains this "cumbersome oddball" (cu-cumbersome?) spends most of its time "sucking sand in through one end of its body, extracting anything nutritious from it and passing what it doesn't want out the other end."

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Meet the pearlfish!

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Natural World explains these slender and slithery fishes go to "extreme depths" to find a safe and secure place to hide from predators.

Wanna take a wild guess where this pearlfish hides?

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Yep. Up the sea cucumber's butt.

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Natural World notes the pearlfish is actually rather "clever" for performing a colonoscopy on living in the sea cucumber because most sea predators are repulsed by it. Both creatures remain safe, even though one creature takes the backdoor to sanctuary.

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But... the pearlfish benefits more from its commensal relationship with the sea cucumber — and will spread its wealth.

Not only does the pearlfish squat in the sea cucumber, but it also invites its friends and family to stay in the occupied asshole. 

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Kind of an ass-inine thing to do.

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Read more: 8 Amazingly Weird-Ass Animals You Never Knew Existed

h/t Digg