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Sounds like a physical injury, this could be caused by many predators in our area, Praying Mantis , Hornets, Wasps or birds. Last year I was in the yard and noticed a praying mantis about six inches long and as big around as your thumb perched on the side of the landing board just chowing down. There was a little pile of bee parts on the ground below her. I went home got a jar and caught her with a small fight and put her in the garden.