Yesterday I saw a crow swoop down on my three roo's all standing in the driveway. One swoop and it was gone. Two are big BO's and one is an OEGB. Actually the OEGB was larger than the crow and in all actuality it did not seem to bother the roo's. This morning, before I let the chickens out, a crow (same one???) was walking up in the driveway looking at all the fallen black walnuts, maybe looking for insects?? I am wondering if crows are threat to larger birds. I know they will eat chicks but could this be a territory issue??