@JulieB, Since you live in California, do you by chance recognize these Hummingbirds? The photos were taken on different visits to the San Diego area. I think the first one may be a male Allen's Hummingbird but for the other two I'm not sure at all. The third one looks like our Ruby-throated but I don't think the Ruby-throated is found in California.
Aug. 2013 Balboa Park, San Diego ..... July 2010 La Jolla, Ca. ...................... Jan. 2015, Shelter Island ,San Diego