Arctic sponges leave trails as they wander
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Arctic sponges leave trails as they wander

The sponges were thought to be stationary, but they leave sneaky spikes on the seafloor.

This image shows trails left by Arctic sponges as they crawl across the seafloor.
Trails left by sponges as they crawl across the seafloor. Credit: AWI OFOBS team, PS101
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