Assertion: pygmy marmoset's nail | /r/AtLocation | human
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text: Pygmy marmosets are able to support their weight on the tips of their long, sharp, claw-like nails (called tegulae) which are different from the flat nails (called ungulae) seen in other primates, including humans, and are probably an adaptation to a life spent clinging to trees (Kinzey 1997; Sussman 2000).