From Upper Mississippi River National Wildlife & Fish Refuge:
Who lives here? It's not who you might expect! Burrowing crayfish make tunnels in damp soil that go all the way down to ground water. The little chimney-like soil stack they leave behind is made from the material they throw out as they burrow.
Photo: Crayfish burrow by Erin Adams/USFWS.
#animal #crustacean
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