European eels navigate during long migrations by being sensitive to many different types of stimuli.
"Those specimens that do complete their life cycle use many environmental cues to navigate during their migration. Not only are eels highly sensitive to olfactory stimuli, they also respond readily to small fluctuations in water movements, seismic activity, and even to the minute electrical fields generated by water currents." (Shuker 2001:74-75)
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