A crayfish with raised claws beside a moulted exoskeleton shell, a freshwater stream with rocks, and a cooking pot on a light gray background.

Freshwater Lobsters That Eat Their Own Shells — How Well Do You Know Crayfish?

Difficulty

Hard

Questions

30

Volts

3/q

They eat their own shells for calcium, their own feces for protein, and Sweden throws parties in their honor every August. Crayfish are freshwater crustaceans with Triassic roots and a plague named after them. This quiz digs into the mud.

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