the.com/opposable
The thumb's killer feature: facing its neighbors so you can finally grip the jar.
means Describes a digit, usually a thumb, that can be positioned against other fingers to grasp and manipulate objects.
from From Latin opponere, to set against — the same root behind oppose, because the thumb literally stands across from the fingers.
Primate badgeMost primates have them; humans flaunt them best.
Not uniqueOpossums and pandas evolved their own versions.
Panda cheatPandas use a wrist bone, not a true thumb.