For about 4-5 weeks now, my Blue Jay and squirrel population has dwindled to barely anything, when it used to be I couldn't count the number of each. I've also just lately noticed that there are hardly any cardinals either. The only two things I can attribute this to (and the first is very iffy) is No. 1) I moved 1 bird feeder pole to another area (due to soft, sinking earth) with the flat plank on the stump remaining there, from which the blue jays, cardinals, and squirrels ate nuts and seed; or No. 2), we have had visits from a hawk (I'm pretty sure a Cooper's), who has killed and taken tw