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Primates emit different kinds of vocalizations in different contexts (Struhsaker, 1967; Snowdon and Pola, 1978; Seyfarth et al., 1980; Robinson, 1982; Boinski et al., 1999; Oliveira and Ades, 1998; Maccowan et al., 2001; Di Bitetti, 2001, 2003). For example, long calls can serve as localization cues for conspecifics and are often produced in the context of territorial encounters, mate attraction, and isolation/group cohesion (Waser, 1982; Miller and Ghanzanfar, 2002). Vocalizations used in close-range social interactions may be given in many different situations, such as resting, grooming, foraging or playing (Seyfarth, 1988). Some primates have different alarm calls for different predators (Struhsaker, 1967; Fichtel and Hammerschmidt, 2002; Fichtel and Kappeler, 2002). An often-cited example is the alarm repertoire of vervet monkeys. In this system, receivers respond differently to different calls: for example, they look up and move down or into cover just after an eagle alarm call, and they run into the trees just after a leopard call (Struhsaker, 1967; Seyfarth et al., 1980). The appropriate response contingent upon danger increases chances for survival and reproduction, thus, improvement in fitness. Vervet alarm call specificity improves with age: at first, infants do not show much discrimination among predator classes (they may give eagle calls for non-raptors, for example); then, they give alarm calls for raptors that are not their predators; and finally they learn to vocalize only for the correct raptor predator (Seyfarth and Cheney, 1986; Seyfarth, 1988). Nevertheless, it is difficult to separate the role of genetics and environment affecting development (Seyfarth and Cheney, 1986; Seyfarth, 1988).

Capuchin monkey (<i>Cebus apella</i>) vocalizations in response to loud explosive noises