Yesterday I posted a couple of marginal pictures of a crow in my yard with a strange growth on its face. The responses I've gotten so far land on either an engorged tick of possibly avian pox. Luckily the bird returned and I was able to get much better shots of the growth in question. I'm now pretty sure it is not a tick.
The cooperative bird gave me views from both sides of its face and the structure of the growth is much more visible. I still don't have a clue to its origin but if anyone has a guess I'd love to hear it.
The bird still seems normal in all respects except for this object. I hope the bird will continue to hang around my yard so I track any changes in its behavior or in the growth itself. Meanwhile, I think it's time to start looking for migrants. Cheers!