sentence: Some instinctive behaviors depend on maturational processes to appear.
sentences_after: However, young birds have been experimentally reared in devices that prevent them from moving their wings until they reached the age at which their cohorts were flying. These birds flew immediately and normally when released, showing that their improvement resulted from neuromuscular maturation and not true learning. Campbell and Reece, 6th ed.
concept_name: instinctive behavior
headings: Instinct Overview Maturational instincts
categories: Psychology Ethology