The reading gives characteristic of imprinting.
Young geese and ducks will follow their mother during sensitive period. If they are separated from their mothers during this time, they will not develop ability to follow her. Konrad Lorenz descripts that imprinting appears immediately after hatching and it can develop lasts for at most a few days. Moreover, the imprinting was irreversible, wonderful, and young bird can follow suitable moving object if the mother is not available.