Don’t know what’s going on? Take a picture – it might be useful.

Many years ago I went out into the desert and there I met a man who had a vision. I'll have to stop doing that... building up my story before I've started. More prosaically, I was setting up to film a sequence on elf owls for a  movie about, well, what else but owls... and the man I met in the desert was Bill Peachey, one of those experts the B.B.C. seek out  when their freelancers aren't sure what they are doing - pretending to know is useless and in any case, you can't know everything. Elf owls nest in…