Assertion: spider monkey's thumb | /r/HasProperty | external
Facets:
Source sentences:
text: Unlike most other primates, spider monkeys lack an external thumb, but this is not because they are less evolved than other primates (Erikson 1963; Fleagle 1988).
text: Unlike most other primates, spider monkeys lack an external thumb, but this is not because they are less evolved than other primates (Erikson 1963; Fleagle 1988).