that spend far more time foraging for plants foods than animals. Most of the plant food consumed is ripe fruit, the majority of which are figs, but also palm nuts, seeds, berries, flowering buds, shoots, barks and gums. Their animal prey is almost exclusively invertebrates. Their prey consists of snails, arachnids, wasps, caterpillars, grasshoppers, ants, birds eggs, other small mammals and many insects that inhabit palm crowns. Some coastal populations may also include oysters, crabs, and other marine life in their diet. While males and females spend about the same amount of time foraging for insects, they exploit different types of resources. Males spend more time searching for insects on the surface of branches, while females search for most of their insects atop palm trees. There is little variation in plant material consumed between males and females. Also, adults and sub-adults eat more animal material than juveniles and infants. Food washing Food washing has been observed in non-human primates including macaques and capuchins. The primates will sometimes wash their sandy fruits and foods prior to eating them. This act has been described as an example of protoculture. Wedge-capped capuchins were shown to wash sandy food in four spontaneous occasions in both captive and wild populations. Urbani found that food washing was a response to certain circumstantial problems and not through imitation or learning, as argued in studies of other species. Behavior Wedge-capped capuchins live in groups ranging from as few as 5 individuals to more than 30 individuals. The groups generally consist of one reproductively active adult male, several adult females and their offspring, and, in some cases, non-reproductive adult males. Juveniles generally make up about 50% of a groups population. The population structure is heavily skewed toward females. There are approximately 2 females to every male at birth. This ratio increases to more than 4 adult females for every adult male. This is the result of both female-biased birth ratios and male migration behavior. Birthrate in wedge-capped capuchins varies with age. Younger and middle-aged females (6 to 26 years old) give birth as often as once every two years. Older females (older than 26 years) may only give birth once every three or four years. It is important to note that both male and female wedge-capped capuchins live as long as 36 years. In wedge-capped capuchins, males emigrate from their natal groups while females generally remain in the same