It's nice to see more photos of your hummingbirds, RBMom - and your sister's. I have only ever seen the Rufous and Anna's here, so it is interesting to learn about other hummingbirds in different parts of N. America.
I can barely tell the two species apart when they are flitting around, but the behaviour of the Rufous males makes their identification easier. They are known to be very feisty, and they constantly dive and swoop around, making their little twittering calls as they chase others away from the feeders. Of course, they are all gone now, so it's not too difficult to identify the remaining Anna's, and the male is readily recognized by his dark head
I realized when I first started watching them that the immature ones take a while to get their full adult feather colours. Here is a young Anna's male at the feeder, with his blotchy/patchy iridescence showing. I guess it takes a while before all the 'fluorescent' feathers get their blazing colours.
I first had a glimpse of an immature male Anna's 'hidden' in our plum tree in late spring. I think these little hummers are easier to photograph as they seem to perch more than the Rufous, which seem to be constantly on the move.