From an older review article [Hart NS, 2001. The visual ecology of avian photoreceptors. Prog Retin Eye Res. 20:675-703], a quick line in the abstract says it all..

"Birds have five different types of visual pigment and seven different types of photoreceptor-rods, double (uneven twin) cones and four types of single cone."

I think the negative emphasis on UV detection in Nolan's huntingnet article is way over-rated. There are so many objects in nature that emit in the UV spectrum, that paranoia for turkey hunting is just not sensible. I wonder if he's ever taken that blacklight into the forest, and seen how many things actually emit in that wavelength. He'd probably be surprised

Now, for deer hunting, it's a slightly different matter. There are not many UV blobs naturally suspended in the treetops...