in psychobiology, a form of learning in which a very young animal fixes its attention on the first object with which it has visual, auditory, or tactile experience and thereafter follows that object. In nature the object is almost invariably a parent; in experiments, other animals and inanimate objects have been used. Imprinting has been intensively studied only in birds, especially chickens, ducks, and geese, but a comparable form of learning apparently occurs in the young of many mammals and some fishes and insects.

In mallard ducklings and domestic chicks, imprinting can be accomplished in a few hours, but receptivity to imprinting stimuli vanishes at the age of about 30 hours.