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Inside the brain of a crayfish Voyage to the bottom of the sea, or simply look along the bottom of a clear stream and you may spy lobsters or crayfish waving their antennae. Look closer, and you will see them feeling around with their legs and flicking their antennules - the small, paired sets of miniature feelers at the top of their heads between the long antennae. Both are used for sensing the environment.
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