Hovering Blackbirds

Over the past two weeks one of the blackbirds in the garden has started to attempt to hover near the fat ball feeder. I've not seen this behaviour before in a blackbird. Perhaps someone else has. It starts underneath the feeders then flies up to the lower fat ball taking a quick peck before floating to the ground. I watched it do this 19 times this morning before moving off to another part of the garden.
The photos aren't great, pretty poor really due to the available light. but they do show how the blackbird behaves.