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Robots have to be able to move, perhaps quickly, on all kinds of terrain — search and rescue missions on remote parts of Earth or explorations on other planets like Mars will require i...
Yep! 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 ...