Color Variation in Bornean Gray Gibbons

Geographic and Individual Variation in Bornean Gibbons, with Remarks on the Systematics of the Subgenus Hylobates

“…Browner than Klumpang, with less ventral and cap darkening, more facial contrast but more usually a brow-band only; extremities not usually darkened, occasionally lightened. This is in agreement with the field observations of Stott and Selsor [1961],…”

“…It is not stated how many skins were studied by Buttikofer : they have not been seen by the present author. Stott and Selsor [1961] extended the observations of variability made by H ose, G y ld enstolpe and others, to Sabah. They describe the usual colour type of gibbon there as being more or less as K loss stated, with the feet often paler and an occasional white face-ring; one-sixth of the gibbons seen were darker (brown-black), one-sixth lighter (pale grey, with a dark cap).…”