The birds are broad-tailed hummingbirds. They look very similar for the popular ruby-throated hummingbird and are often mistaken for the ruby-throat. Because rubies are probably the best known and most popular of the hummingbirds, I had originally planned to use ruby-throats here. The reason I ended up using broad-tailed instead is for color harmony. I really wanted to use the complementary colors of permanent rose and phthalo green. One way to distinguish a ruby-throated hummingbird from a broad-tailed hummingbird is by the color of the throat. While both are red, the broad-tailed hummingbird's throat is more of a rose colored red, while the ruby's leans more toward reddish orange. Sometimes the ruby's throat can appear very orange, even yellow-orange, when the sun hits it at certain angles. Because I wanted to keep my colors on the rosy side and not introduce orange, I chose the more rosy colored broad-tailed hummingbird. They are just as pretty as the ruby-throat so perhaps it's time they get more attention. :)
Btw, another way to distinguish a broad-tail from a ruby is by the shape of the tail. The broad-tailed hummingbird's tail is straighter along the bottom. The ruby-throated hummingbird's tail is forked, forming an inverted V. The tail shape is probably the easiest way to distinguish them. Read more about the broad-tailed hummingbird here on National Geographic.
Prints and notecards of this painting are available on my Fine Art America page: