John C. Landa Jr., the “Schulenbirder,” shares three hummingbird photos from his backyard in Houston. All are of a ruby-throated hummingbird. An interesting feature of this species is the throat color of the male, which seems to change from black to bright red depending on the angle of the light. If the sunlight hits the throat at a flat angle, the color that is reflected appears to be black. But,…