 On the other hand, Bernstein found that the two monkey species sometimes travel together and even feed in the same trees at times.The conservation status of the Selangor silvered langur has not been evaluated since it was identified as a separate taxon.A study by Khan published in 1978, prior this recognition, suggested that the population in West Malaysia had declined from about 6,000 individuals to about 4,000 over the period of 1958 through 1975.