No snow now, but the Anna’s hummingbirds were guarding the feeder most of the time when it was cold, especially when I would thaw it. One especially cold hungry day, it dive bombed me when I went to wrap a warm towel around the feeder to warm it up. Fierce little birds!
But it also did the behavior pictured. I think it’s beak cleaning, but it sure looks like sharpening. Just like sharpening a knife.