Assertion: gibbon's thumb | /r/HasProperty | a very small digit
Facets:
Source sentences:
text: These animals thumbs range from completely unopposable where the thumb can not be rotated, as in the marmoset and the tamarin, pseudo-opposable where there is partial rotation of the thumb to the side of the hand, and a third situation, as in the spider monkey, where the thumb is actually a very small digit - only 15% the length of the other fingers, and has very little use at all.