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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)
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Duet song, Xujiaba, Ailao mountains, China, 27 Aug. 1990. |
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Duet song, Xujiaba, Ailao mountains, China, 26 Aug.
1990. The great calls of this female are particularly short. |
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Duet song, adult pair "Nan-Nan" and "Chun-Chun",
Gejiu Zoo, China, 2 Aug. 1990. Other crested gibbon sing in the background. |
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Male solo song, Xujiaba, Ailao mountains, China, 25 Aug. 1990. |
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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. |
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