Richard Fortey is the chap from the Natural History Museum, isn't he? I've read a book of his, forget the title...something about a dry storeroom. I'll keep an eye out for the fungal one.
Going back to UV. Iirc vole's urine shows under UV, they piddle to mark their runs, and kestrels have eyes that can perceive it, so can see where the voles have been going.