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Nomascus concolor

Fully developed male vocalisations consist of three different types of notes typically uttered in the following succession: one boom produced during inflation of throat sac, a series of short simple staccato notes ("aa"), and a series of highly frequency modulated notes (termed multi-modulated figure by Haimoff, 1984). The first note of the multi-modulated figure is of ascending frequency only; rapid changes of frequency modulation occur on second and sometimes on third note. Females produce great calls only. Great call with an acceleration-type climax, like H. moloch, of moderate speed, not becoming slower near end. Great call consisting of 10 or less notes, notes beginning with descending frequency. Twitter-like vocalisation at the end of great call. Male produces multi-modulated phrase as coda. Duet song bouts.

a. male short phrases (Gejiu Zoo, China, 2 Aug. 1990)
b. great call sequnce consisting of female great call with male contribution (Xujiaba, Ailao Mountains, China, 1 Aug. 1990)

Nomascus concolor sound examples:
Press to start sound Duet song, Xujiaba, Ailao mountains, China, 27 Aug. 1990.
Press to start sound Duet song, Xujiaba, Ailao mountains, China, 26 Aug. 1990.
The great calls of this female are particularly short.
Press to start sound Duet song, adult pair "Nan-Nan" and "Chun-Chun", Gejiu Zoo, China, 2 Aug. 1990.
Other crested gibbon sing in the background.
Press to start sound Male solo song, Xujiaba, Ailao mountains, China, 25 Aug. 1990.
Press to start sound Adult male "Don-Dong", Gejiu Zoo, China, 1 Aug. 1990.
This male continued with some solo singing at the end of a duet song bout with his mate.