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Unlike cats and dogs, whose whiskers are made of hair, catfish have special whisker-like feelers made of skin. Each barbel is loaded with tiny taste buds and special olfactory sensors to help the fish smell. Catfish tend to live in dark, murky waters where their vision isn't very useful.
Experiments on blindfolded individuals suggest that they use their long, sensitive whiskers to follow the wake left by schools of fish, attempting to then single out and grab an individual. Video cameras mounted on the backs of male seals show that sand eels and flounders are caught by cruising just above the sea bed.