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“A thumb, yes, because the opposable thumb is what differentiates us from beasts.”

And when it comes to distinguishing features, the ability to conjure imaginary worlds is simply sexier than the opposable thumb.

Sprouting from your palm are four fingers and an opposable thumb.

Dogs living outside human control may use force to establish their social hierarchies, but so long as you are the one with the big brain and the opposable thumb, who can operate the can opener and unlock the front door, you have no need to demonstrate your status with shock collars and other tortuous instruments — and doing so would not make your dog any more likely to look up to you.

Few species own the opposable thumb that gives humans, for example, the power to literally get a grip.