Birdsong and Buffalo

Last night, I had the great pleasure of falling asleep to the sound of birdsong. I'd found it, by chance, where the defunct OneWord Radio used to be, and I was delighted. Sadly, it had gone by the time I first awoke, a couple of hours later. Why, though, isn't there a birdsong channel on radio? It would certainly get listeners - in fact, I believe when birdsong is used as a test transmission, or to keep a channel open, it can get more listeners than the programmes. Television could adopt the same approach too - what could be more restorative than watching, say, a field of cows grazing, or sheep on a hillside? I remember sitting in a 'home cinema' in a TV showroom in New Jersey (don't ask), watching a channel entirely devoted to footage of buffalo grazing on a prairie - the most perfectly restful TV I ever saw. Who needs programmes?