A soundscape to go with Episode 1. A full playout of the Sumatran rainforest recording that Pan finds. Whistling thrush, cicadas, howler monkeys. Flies buzz the microphone. Headphones are best. With sound design by Graham Wild and Becky Ripley.

And you can take part in our Forest 404 Experiment to see how you respond to natural sounds at: bbc.co.uk/forest

#Forest404