[Irrampbroow]

He may have said something about opposable digits. Two fingers alone would give you the ability to hold, but you really need three to manipulate implements in three dimensional space.

This is Bing speaking, so we can't be entirely sure he's on the mark. But he hasn't let me down in general. Although once he starts talking about shotguns his eyes glaze over and we have to lead him away by the arm.