Baldwin J D, Baldwin J I
Folia Primatol (Basel). 1976;26(2):81-108. doi: 10.1159/000155733.
This report presents an analysis of the vocal repertoire of howler monkeys (Alouatta palliata) observed during a field study in southwestern Panama. 26 types of vocalizations were identified and described, and sonagrams are presented for 21 of them. The vocal repertoire contained many nondiscrete calls that graded continuously into each other, and all of the calls appeared to fit into 5 or 6 broad families. A tape recording of the vocalizations described in this study is available.
本报告呈现了在巴拿马西南部进行的一项野外研究中观察到的吼猴（Alouatta palliata）发声库的分析结果。共识别并描述了26种发声类型，并给出了其中21种的声谱图。发声库包含许多非离散的叫声，它们相互之间呈连续渐变，且所有叫声似乎可归为5或6个大致的类别。本研究中描述的发声的录音可获取。
