Originally posted by j_kalin
Wouldn't a bigger brain have benefitted a bear or a lizard or an octopus? yet they didn't get one, despite living on the same planet as us.
That's not the way natural selection works. It's not a matter of whether or not a species might benefit from having certain characteristics, it's
a matter of whether a small variation in the species already exists enough to get it through tough times.
Obviously, bears, lizards and octopi already had the attributes they needed to get through the ice ages, or they wouldn't have made it. And they
didn't start out in the same place we did, anyway. We started out as these little monkey-things, not bears. So any variations in that population
allowed some of us to survive and eventually become the people we are today.
As for us being tremendously superior to our primate cousins, the more we understand about them and ourselves, the more we become aware of the
similarities, and not the differences measured in percentage variations in DNA. Yeah, we're clever, and our ability to speak and communicate using
abstract symbols has definitely worked out well for us (until we overpopulate the planet, anyway).
But those things are a matter of tiny degrees of difference between us and other animals, and not that difficult to account for with natural
selection. No curious, industrious aliens required.