Well that's another large disagreement among psychologists. I believe the teachings that humans do not have instincts. It's what I was taught in college and high school, and I still believe it today.
What about the suckling response in babies right after they are born, or crying? Not learned....
And we still have some instinct, What is a panick attack? Its a flight response to a situation that your body feels is threateing or stressful, You cant control this at the time, so its classified as a instinct, even if a distorted one.

Maternal instinct, For those who beleive snakes are pure instinct, pythons have a instinct to coil around there eggs and keep them warm and protect them. Human mothers have something similar. If they have no instinct, they developed similar reactions yet one is reason, the other instinct?

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As for reason, I meant learn, A snake that has escaped, will try the same route over again every time.
http://www.anapsid.org/smartsnakes.html

My point with the dolphin and shark was not to compare it to a snake, But apples and oranges can sort of apply, they are both fruit, and both can be eaten. They have a similar end result, but are different in the make-up. But im pretty sure thats not the way you meant it. All i was saying is that with dolphins and sharks, structure is totally different and unrelated, one has cartilage, other bone as far as skeleton, but they both do the same thing as a final result. The part in the human brain that feels emotions may not be in the snake brain, but another part which is physically different, may have the same end result (emotion ext)

with the dogs, i was just talking about dog emotion in general as it seems like it is part of the thread, Gorillas have not been domesticated, would be a cool pet minus the overpowering part, and danger. Just saying that intelligence doesnt always relate directly to all subjects involving the brain, and that the instincts can change. After 3-4 generations of domestication the foxes were just like dogs, how many generations are some CB snakes? We cant assume they never will adjust to humans either. but that i dont beleive was my origninal point, sorry my minds kinda scattered atm...

As for evidence, im currious as to what, THere is no such thing as evidence towards something not existing, as the not existing thing has no evidence. So just like with trials, there is only proving something happened or exists, not that it cant.....

See, even in animals, you can habituate an animal not to respond to its instincts. We despook horses. We train dogs not to eat small critters that we don't want them to eat. But we would not say those animals do not HAVE the instinct.
adding to that...Instinct can be broken too. Just a quick example with reptiles. If someone quickly jumps infront of my beardie, it puffs up its beard and opens its mouth, after a few times of being "spooked" it doesnt react at all to it anymore. ---Habituation

Good points everyone,
Ben