Insert the words to complete the sentences. learned added to insightinnatehabituationoperant conditioningclassical conditioning Animal behavior includes learned behavior such as courtship behavior, which evolved through natural selection. This behavior helps members of the same species find each other and mate. Animal behavior also includes behavior. The simplest type of learning is , a process by which an animal decreases or stops responding to stimuli that neither reward nor harm it. The most complicated form of learning is learning, or reasoning, which occurs when an animal applies something it has already learned to a new situation. In , a certain stimulus comes to produce a particular response, usually through association with a positive or negative experience. In , an animal learns to behave in a certain way to receive a reward or to avoid punishment.