Crayfish Trivia Facts Freshwater Cousins of Lobsters – Crayfish (also called crawfish or crawdads) are closely related to lobsters but live in freshwater instead of the ocean. Over 600 Species! – There are more than 600 known species of crayfish around the world, with the majority found in North America. They Breathe Through Gills – Even though they live in freshwater, crayfish have gills just like fish, which means they need clean, oxygen-rich water to survive. Masters of Regeneration – Crayfis

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