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Sand Bubbler Crabs make tiny sand balls

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It’s a beach full of crab-made sand balls! From the BBC’s Blue Planet, episode 3 Tidal Seas, watch some Sand Bubbler Crabs make sediment balls on a beach in Australia. From wikipedia:

Sand bubbler crabs live in burrows in the sand, where they remain during high tide. When the tide is out, they emerge on to the surface of the sand, and scour the sand for food, forming it into inflated pellets, which cover the sand. The crabs work radially from the entrance to their burrow, which they re-enter as the tide rises and disintegrates the pellets. The material consumed by [the crabs] has a very low concentration of organic matter, which is concentrated by egestion of indigestible material.

sediment balls
sand bubbler crabs - sand balls
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