Parrots  hold the evolutionary secret of why we're left-handed
or right-handedS  Almost everybody has a dominant hand that they
use, but it's actually a mystery why that is. After all, we can
see both of our hands just as well, and there's no built-in
reason why one should work better than the other. But some
grabby parrots might hold the deep evolutionary reason behind
handedness.  Researchers had 322 parrots from 16 different
species attempt to pick up an object beneath them with their
feet. Because parrots have eyes on the side of their heads, they
can't look directly down at the object to help them pick it up.
Instead, they have to cock their head to one side or the other
to see what they're trying to grab.  The parrots consistently
showed a preference for grabbing the object with one foot or the
other, and this was in turn reflected by how they cocked their
head. For instance, let's say the parrot was right-handed - or,
perhaps more accurately, right-footed. In that case, the parrot
would almost always c