I noticed the other day that my suet feeder had a unusual hole up at the top of the block. Most the birds that frequent the suet block are Carolina Wrens and occasionally, my little Downy Woodpecker friend.
Well, I finally found the culprit. I have several Blue Jays in my back yard. They have seem to have developed a knack for hanging upside down to peck at the suet to knock it loose and get a little bit to eat.