From Dictionary.com...
"emotion - an affective state of consciousness in which joy, sorrow, fear, hate, or the like, is experienced, as distinguished from cognitive and volitional states of consciousness."

"instinct -
1. an inborn pattern of activity or tendency to action common to a given biological species. 2. a natural or innate impulse, inclination, or tendency."

Quote Originally Posted by Jack View Post
Any time a creature reacts to a particular stemuli, it does so because it is experiencing some sort of emotion.
I disagree. Instinct far better describes the reactions in my opinion than does emotion.