It can be very difficult to distinguish calliope from rufous females. On the calliope look for green on her back and tail. The rufous female will show rufous-coloring on the rump and tail.
"Female calliope; distinct typical back feathers with light rust-colored breast and partial red throat gorget. Watching the courting flight ritual performed by a nearby male." Osoyoos, British Columbia 04/27/14
Christine Haines
