White-fronted capuchins were observed to use leaves as cups to retriev
e water from tree cavities. On multiple occasions several individuals
performed this behavior. Thus, these capuchins engage in habitual tool
use, as defined by McGrew's classificatory scheme of tool using behav
ior. Am. J. Primatol. 46:259-261, 1998. (C) 1998 Wiley-Liss, Inc.