Here in Northern California, Anna's Hummingbirds are the only hummers that stay the winter. There are enough flowers and insects year-round to keep them from going hungry. In my yard, they visit my feeder as well as my fuchsias, red-hot poker (Kniphophia), coral bells, and other flowers. Hummingbirds are picky and I have to be careful to keep the feeder very clean - no dirty sugar water for these guys!
They are really hard to photograph. This is the female:
And this is a sadly unfocused photo of the male:
Check out a google image search for Anna's Hummingbirds to see much better photos of their amazing iridescent hot pink head feathers.
They make a surprising amount of noise for tiny birds, a dry, high pitched chirping noise. And of course they sound like giant bumblebees while flying - if you are near enough to hear it. They fight over the feeder, chasing away other birds. I think I only have two right now, but earlier this spring I did find a tiny hummingbird nest in my giant bamboo:
The nests are made out of cobwebs and grass and tiny twigs. Yes, cobwebs: I watched mama hummingbird collect them. I'm not sure what happened - whether there were babies or not. Still, I will keep watching.