Optomotor response
Encyclopedia
The optomotor response is an innate behaviour common to fish
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

 and all insect
Insect
Insects are a class of living creatures within the arthropods that have a chitinous exoskeleton, a three-part body , three pairs of jointed legs, compound eyes, and two antennae...

s. It serves for course stabilization during free locomotion through an involuntary displacement from a straight course. The purpose of this behaviour is to regain the desired course of locomotion.
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