The BBC Natural History sound collection is a library featuring over one hundred years of wildlife recordings. Recorded in the days before digital archiving, they illustrate the timeless nature of audio.

Between 1998 and 1999 Mark made several trips to Indonesia where he gathered wildtracks for various BBC documentaries. These included male orangutan long calls, tribal ceremonies and forest dawn choruses. A selection of these sounds are now available here for all nature-lovers to appreciate.