Why have Only Humans.....

[vhawk01]

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It's a combination of all the above.

We were lucky enough to be one of the species with oposable thumbs that also stumbled upon a diet in Africa that made our brains grow.

We were also lucky enough that the dinosaurs were wiped out.

We were also lucky enough to do it first.

We were unfortunately not lucky enough to evolve into a natural state of equilibriam with the Earth's enviorenment.

Oh well, 4 out of 5 aint bad.

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Such a ridiculous myth that there even IS a natural state of equilibrium in nature, much less that any animals "evolved" to fit nicely into it. Every animal species is bent on manipulating its environment to its own benefit. This "equilibrium" you talk about does not exist.