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As a hermit crab grows its shell becomes a tighter fit so eventually the crabs need to move into a bigger one, leading to an amazing exchange. Taken from Life Story. Subscribe to BBC Earth: http://bit.ly/ydxvrP Watch David Attenborough Dynasties series trailer here:

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In this exciting excerpt from the third season of Jonathan Bird's Blue World, Jonathan films a hermit crab changing shells and then also transferring its anemones from one shell to the other. This is extremely rare footage of a seldom-seen behavior! #underwater #scuba #scubadiving #symbiosis #marinebiology #hermitcrab #anemone #muckdiving To see the whole episode:

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They say 'Home is where the heart is', well for some 'Home is where the bum is'.. Wait! What? Backup! Yep you heard right 'Home is where the bum is', if you're a pearl fish and that bum is a sea cucumber. Sea cucumbers are sausage shape animals that are found on the bottom of the ocean where they vacuum up the sand and filter out all the good bits. It seems as though pearl fish have taken a bit of a fancy for some particular sea cucumbers and set up house in their rear end. Why? Is it the million dollar ocean views? We asked all these questions and more. The upside is, any place you live from now on is going to seem like paradise. The Nature of Science website http://www.thenatureofscience.com.au/ The Nature of Science Facebook

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E: [email protected] Thanks to James Cook University for their support with this video. Check out their courses and all around awesomeness at…