I found this purely by chance and was intrigued by the similarity to our own name: http://www.gardenwildlifehealth.org
Maybe it's my ignorance because it seems to have been going for a long time but I'd never heard of it, and it's comprised of some very heavy players.
The notion of a wildlife (especially birds) diseases databank seems a very laudable aim but I'm still working on the idea of extracting a sample from a dead bird or hedgehog. However, there are braver folk than I.
A cursory flip-through couldn't find a forum such as ours but I'll look again.