The howler monkeys are notorious for the low pitched but high volume howls emitted in particular circumstances. The mechanism for achieving such high voice intensities is still little understood. The present study is based on the dissection of the hyolaryngeal apparatus in 6 Alouatta seniculus, supplemented by the observation of these organs in whole block serial sections (30-40 μm) obtained from 3 A.seniculus and 6 A. caraya.
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Miguel A. Schön (1971) studied this question.
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