Vocalizations and Associated Behaviours in Adult Slow Loris (Nycticebus coucang)

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Abstract
Vocalizations and concurrent behaviours of adult slow loris kept in small groups under seminatural conditions were recorded during their nocturnal activity period. According to structural criteria 8 fairly distinct call types were determined which could be related to one of the two functionally defined sound categories, ‘contact and contact-seeking’ and ‘aggressive and defensive calls’. Comparison with other bioacoustic studies of the family Lorisidae revealed general trends in the evolution of call systems in two subfamilies Lorisinae and Galaginae.

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