Quote:
Originally Posted by Broomstick
So... apparently lateralization appears in species that make/use tools and might have something to do with brain organization. Which side is favored seems a bit of a crap shoot, but the more a species makes and uses tools the more likely the majority will favor one side or another.
Bottom line: it appears to be connected to tool making and use, and since humans are so specialized in that role it makes some sense we'd have strong lateralization.
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Although there are some exceptions - grey whales are mostly right-[s]handed[/s] [s]-flippered[/s] -mouthed, we know this from
imaging their feeding dives and observing the relative wear on the right-versus-left sides of their heads.
Much handedness may indeed be related to tool-use, but other forms of manipulation of the environment may be important to the exceptions.