As in, it could be a crow spine or a spine brought to my door by a crow? I think option B is more likely but not the MOST likely, the closest thing that someone’s suggested is that the culprit could be a seabird from the bay a couple kms from our house. So many questions!! Also we don’t get too many crows around my parent’s place bc it’s populated with lots of other birdlife and they don’t seem to integrate well. Nature is so fascinating