Lovely pictures of spring. I don't have any of my natives blooming here yet, still kind of early. So far just a few of my earliest crocuses are blooming. The weather has been very warm into the 50s and 60s, and I saw a few flies and spiders out and about enjoying the sunshine. Yesterday while doing some garden cleanup I heard and saw probably 1000+ sandhill cranes flying over. Large groups passed over every few minutes for hours... a sure sign of spring. The robins have started scouring the yard for worms too. No bees seen here yet though.
@ wildflowers, I think that bee in your picture may actually be Bombylius major - Greater Bee Fly. The shape and color look about right to me and they hover and move like a hummingbird. I've only seen them a couple of times, but got this picture of one at rest a few years ago.