The wild and wonderful calling of gibbons is a highlight of Thailand's rainforests.
This recording begins in the predawn, with frogs croaking from a streamside pool and the first birdsong carrying through the dense forest. The songs of bulbuls, laughing thrushes, scimitar babblers, and the heavy wingbeats of hornbills all contribute to a tropical ambience.
Eventually a group of gibbons appear, swinging acrobatically through the treetops. The males call loudly to advertise territory; their rich, expressive voices echoing through the forest. Later we hear several individuals calling to each other alternately over great distances.