Definition:
n. Inborn or innate behavior. Source: Durrell, G. and L. Durrell. 'A Practical Guide for the Amateur Naturalist'. Alfred A. Knopf, New York, 1989.
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Examples:
Many newly hatched birds act in a frightened manner when they see the shape of a hawk for the first time, even though the parents have not taught them that the hawk is dangerous.
