Because everyone knows what the President will do next, or how the next world war will happen. Over 6 billion people are in the world. They all have different experiences, different personalities, different memories, and they are still changing. I doubt that is predictable, since they do it without instinct telling them to be such and such.
True, but what makes the behaviour of animals predictable? Learning a person is like learning an animal - you have no idea what they'll do at first, but when around them for long enough, you have an idea of their habits and reactions to different situations, which both humans and animals both exhibit.
By the way, group mentality =/= individuals; since we are talking about individuals, your mob example is irrelevant.
I will retract part of what I said though.
We didn't lose our basic urges and instincts like sex and aggression, but we did lose some of the more specific ones since we don't use them enough. Unless, of course, you would like to prove me wrong.
Men (as well as women) both have sexual urges, but the amounts vary from individual to individual (like with animals). Why do you think porn is so popular? :x
Aggression isn't necessarily something dictated by instinct. Aggression is one of the several reactions noted when an animal (including ourselves) is threatened. The difference between humans and animals with aggression is only that humans, to comply with society's standards (one of the things that has developed with humans and their knowledge), will act in physical aggression less than an animal would. There are still times when humans still exhibit physical agression however (such as when so angry after a car breaks down, that someone kicks the tire, or when a wife throws a fit after finding out her husband had cheated on her).
We both have the same urges; we simply supress them.
Both are not actually instinct because they vary from situation to situation. For example, some women that may "turn someone on" may appear completely unattractive to someone else. Aggression is, as stated before, one of the reactions to one being threatened or simply angered in some way. Some walk away, some get angrier, some even begin to exhibit agressive behaviour; behaviours that exist within animals and humans.
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You obviously believe in Darwinism, so is it all that strange to believe that animals can't be robotic, unintelligent, nonspontaneous beings because they're all unique in their DNA? They all have unique amounts of hormones (like humans) that drive their behaviour (as with us) which makes their behaviour unique. It seems odd to say that creatures capable of solving puzzles (such as the crow from the last page) are incapable of thinking right there and then.
Crows (and many other Corvids) present an interesting example. They are the avian equivalents of the great apes, and their brains are
remarkably used very similarly to our own. They also stand out among most other animals because they are
capable of recognizing humans as individuals rather than simply as "humans". I've witnessed this myself - a group of 25 or so crows used to perch near a pass that I would walk through every day for school, and over time, they became relatively tame and realized I wouldn't hurt them. Instead of perching in safety, they continued foraging when I passed through their area. This behaviour was not repeated with anyone else - in fact, several times my sister had to pass through this area to contact me, and the crows would all be perched, not knowing what my sister would do. Corvids also have
a larger brain-to-body-mass ration than most other animals (along with parrots). Although it isn't sufficient to determine intelligence, this enables the bird to have more surface area on its brain in comparison to birds of similar size. Corvids, along with many other families, also generate quiet sounds that differ from their calls. Interestingly enough, the birds actually wait for the other to finish before starting, as if they were listening to a conversation.