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Sand bubbler crabs (or sand-bubblers) are crabs of the genera Scopimera and Dotilla in the family Dotillidae. They are small crabs that live on sandy beaches in the tropical Indo-Pacific. They feed by filtering sand through their mouthparts, leaving behind balls of sand that are disintegrated by the incoming high tide.

Basically, the tiny balls are a byproduct of the crabs' snacking. They don't eat the sand, but they do feed it through the bottom of an adapted mouth of sorts, filtering out all of the micronutrients that the high tide has brought in and dumped on the beach since their last feeding session.

In each burrow, the crab waits out the high tide in a bubble of air.

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Ten thousand years after woolly mammoths vanished from the face of the Earth, scientists are embarking on an ambitious project to bring the beasts back to the Arctic tundra.
The prospect of recreating mammoths and returning them to the wild has been discussed – seriously at times – for more than a decade, but on Monday researchers announced fresh funding they believe could make their dream a reality.
Read on The Guardian.