Author Aloys Zötl (1803–1887)  
Title German: Der Siamang
Description
from the "Bestiarium"
Date 11 July 1883
Source: https://commons.wikimedia.org/wiki/File:Aloys_Z%C3%B6tl,_Der_Siamang.jpg

The siamang (Symphalangus syndactylus) is an arboreal black-furred gibbon native to the forests of Malaysia, Thailand, and Sumatra. The largest of the gibbons, the siamang can be twice the size of other gibbons. The siamang is the only species in the genus Symphalangus.