Anna’s hummingbird A study of the Anna’s hummingbird (Calypte anna) at Berceley botanical garden. Interesting to see how the color of the head changes depending on how the light falls through its feathers. 1. 2. 3. The color on the head is fully exposed. 4. 5. 6. 7. Not much of the color shows on the head. Compare with images 2 and 3 above. 8. 9. 10. Click to go back to the main page.