It is Saturday morning in Pontianak in West Kalimantan in Indonesia, at a songbird competition. In every district across Indonesia you will find these, large and small. This passion for birdsong has swept the country since it was encouraged in the 1970s, by a government keen to build a new leisure activity for Indonesians. But what was once a solitary and poetic pastime, having a songbird in your house or garden, has become an industry in which real money can be made by training a winning bird. It is one of the biggest threats to Indonesia’s forests which have gradually fallen silent as millions of birds every year are trapped and sold illegally. Can the forest survive without birds?