Haven't caught them in the act so far (eyesites not so good any more) but Bluebirds sure like hanging out near my hives and the flight patterns indicate consumption.
Over the years I have caught swallows, scarlet tangiers, flycatchers and the bigger dragonflys (AND BEARS, I know, not an insect or bird) greedily chowing down my bees.
(I've got some brave chipmonks who like hanging around and under the hives, not sure what it is they're always eating, though I suspect its bits of wax and/or pollen and perhaps varroa?

that have fallen through the SBB etc).
thomas