Bathing in ice water

My Rufous Hummingbird was just now taking a bath in ice water!! This is the second time I've seen such a thing. Today, she landed on the edge of the ice in the birdbath, right next to the tiny drip of water that was keeping a small puddle of water open in the middle of the frozen birdbath. She flipped her wings around and splashed a bit of ice water in the air and then flew off. Of course she chased off a trespassing Carolina Chickadee before she settled in for her bath.