This is a marsh tit (Poecile palustris hensoni) poised to break off a piece of an icicle formed from the sap of a painted maple tree (Acer pictum). During winter months, small birds like this make use of this calorie-rich food source (essentially frozen maple syrup) to fuel their high metabolisms. The birds fly to an icicle, hover, break off a piece and fly away, all in the blink of eye.
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