Crow Feeds Convict Cichlids

I have noticed lately that a Crow keeps visiting my aquariums quite often. At first I didn't mind it, but yesterday and today, I have noticed that my fish have eaten well. Their stomachs seem quite full these past few days. I am the only one who feeds them, so how did this happen? I took a good look at my aquarium and noticed that there were chunks of meat and bones lying around with most of the meat stripped off. It seemed more like bird meat. I have noticed that this Crow keeps bringing food for my fish nowadays. Its really surprising as to why would a damn bird do charity work.

Probably this could be a bait thingy that he's trying out. I have too many Convicts to tell if anyone is missing. I guess I will have to trust the Convicts to be smart enough not to fall for this trick. This is the only explanation that I can think of right now. ;)