Dawn has broken, and the air is cool and still. It’s at about this time that gibbons usually erupt into song, wa-oo-ing and wa-ing from the highest branches and filling the tree tops with rich melodies. But in this corner of Malaysian forest, bordered by housing and roads, the resident white-handed gibbons are quiet. All that can be heard is the hum of traffic from a nearby highway.
This isn’t a rare occurrence for this group of gibbons, according to research, which found these particular gibbons, named Mambang and Walinong, appeared to be producing far fewer morning songs than others that are not exposed to the same level of traffic noise.
