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Instinct is a set pre-programmed actions in animal or human, like when a bird builds a nest or a baby suckle on his mother’s nipple. There are task which require solving problem and they cannot be done using instinct. Please watch this video.Animals have memory, instinct, and emotions, to aid them in solving problems. Not Reason (Intellect) and Will.
Reason is the ability to understand the meaning behind why, and not just perceive the active-cause of how, something is effectively and consequentially good or bad; to grow in conscience of the moral good.
The Will, is the ability to choose and act from one’s reasoned choices, toward a moral end.
vatican.va/archive/ccc_css/archive/catechism/p3s1c1a4.htm
‘1751 The object chosen is a good toward which the will deliberately directs itself. It is the matter of a human act. The object chosen morally specifies the act of the will, insofar as reason recognizes and judges it to be or not to be in conformity with the true good. Objective norms of morality express the rational order of good and evil, attested to by conscience.’
Moreover according to scientific study (please read this article) animal decide which means they need to reason.