[taneq]

Physiologically we seem to be fairly consistent (especially given our relative complexity to a lot of other animals). Mentally? There's an incredible variety of aptitudes both in direction and magnitude. I suspect part of this might just be that we're a relatively 'new' species, and neurologically we've evolved so fast that the results are still a little random.

[ahartmetz]

Regarding relative physiological complexity, I would argue that we are physiologically as complex as any other large, omnivorous mammal. There is nothing special about humans in that regard.

Our randomness might actually be adaptive given the complexity of our societies. There is nothing close among other animals.