Photographing Ravens

Went to a Wildlife Rehabilitation Center today for several hours. They are raising an orphaned raven to be released, and are allowing me in to take some close up photos. After about ten minutes, the birds calmed down and merely watched me from the other side of the enclosure.
I ended up photographing for almost two hours. The main purpose was to get photos of their wing feathers and or them flying which didn’t work so well as they mostly just perched. However, I did get some good close ups and any raven footage will help. Ravens out in the wild are very wary and rather hard to photograph up close unless you encounter a roadside raven bumming food at a tourist stop.