合趾猿 (Symphalangus syndactylus) 是一种栖息在马来半岛与印度尼西亚苏门答腊岛雨林的长臂猿。它们身上覆满全黑的蓬乱毛发，脸部的毛为灰色且较细。合趾猿的手臂很长，臂展约为身长的两倍，它们的双腿较短且粗壮，没有尾巴。它们其中一项最著名的特色是下巴下方的喉囊，在发出其独特叫声时会充气胀大。合趾猿一般身长 75 厘米至 100 厘米，体重介于 10 公斤至 13 公斤之间。此物种与其他长臂猿一样，只有极少的两性异形情况，甚至完全不存在两性异形。
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Symphalangus syndactylus
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true
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siamang
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Animal Facts
Siamang monogamous pairs will often sing together for several minutes to mark and defend their territory and bond with each other.
The Siamang is the largest species of gibbon.
Siamangs play an important role in their native ecosystems, as frugivores they aid forest regeneration by spreading seeds via defecation.
Two toes on the siamang’s feet are connected by membrane, a feature unique to the siamang within the gibbon family.
Siamang families develop very close bonds; parents mate for life and the whole group travels together.
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