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Anuran communication is dominated by acoustic signals; consequently, most species have well-developed vocal systems that can produce a variety of sounds in different situations (Duellman and Trueb 1986). The advertisement call is the most commonly emitted sound in this repertoire; males produce this vocalization in both reproductive and territorial contexts (Gerhardt 1994, Wells 2007), and it usually is accompanied by the inflation of a vocal sac with pulmonary air (Pauly et al. 2006). Vocal sacs occur widely in anurans and are thought to be involved in both acoustic and visual communication (Narins et al. 2003, Rosenthal et al. 2004).

Advertisement call of Craugastor noblei: another calling species of the Craugastor gollmeri Group (Anura: Craugastoridae)