Intuition vs. Instinct

I've been doing a lot of reading about intuition and ran across something that caught my interest the other day.  It made me think about whether instinct is different from intuition or whether intuition is just another form of instinct.

The writer was expressing their feeling that intuition is expressed firstly and clearly in their body.  For example, it would occur when you get that upset stomach feeling or gut feeling before anything specific has occurred in your presence to explain it.

For me, I sometimes get that feeling when someone is angry around me.  It's like my body recognizes the energy of anger and a warning bell goes off.  The anger doesn't have to be directed at me for this to happen.  Now, can this be explained as instinctive behaviour - preparing me to run or fight?  Or as intuition - a connection with a nearby subtle energy field?

I'm thinking that our connection with energy fields is a part of our instinctual behaviours.  If intuition is actually different from instinct than I'd have to say that it is a more evolved form of it.  Where instinct helped to protect us in the past when the lives of the human race were about eat or be eaten; similarly, I think that intuition protects us by incorporating more complicated, yet subtle, information that needs to be interpreted by us for a proper response to the circumstance.  Our choices are more varied now - far beyond the original two of fight or flight.

So, what do you think?  Is intuition an evolved form of instinct?

I welcome your comments on this topic.  Please share your experiences of intuitive moments.