What a comedy that man should work so hard to prove that his chief glory is his opposable thumb, or a few ounces of brain matter!
It had the same place in crustacean development that the opposable thumb is believed to have had in that of man.
What would man's power be as a tool-using animal without his strong, opposable thumb?
A thumb that can be used for grasping.
Note: Opposable thumbs are one of the distinguishing features of primates.
Note: The opposable thumb of human beings allows us to use tools.