Dennis, those pterodactyl’s are some tough customers! Wonder if he flew off to go see his Chiropractor!?!
Couple things could have gone wrong. If you are up to power that would have been somewhere at about 550fps. I've taken crowd with far less than that. Sooo.1. Your power is down.2. The pellet wasn't actually loaded due to excitement, maybe pellet fell out, maybe 177 was put in?I don't think you even hit feathers. If you did that crow would have had him and his friends circling and screaming for a good 15-20 mins. Did you see feathers go flying at least?
Dennis, from what you said about how the crow acted stunned after the shot & how it took him a few seconds before he flew off, I’d bet you lethally wounded him. He probably only flew 100-200 at the most & crashed.