Falcons are found worldwide ... This allowed us to estimate the level of solar radiation to which the birds in the photos were exposed, and to compared that with their malar stripes.

Photographer Jack Zhi's dramatic picture of a female peregrine falcon ... the pictures that were awarded a gold, silver or bronze, with descriptions by the photographers. Henley Spiers/Bird ...

Raising and training falcons in captivity can help conserve ... which had flown across the battle lines. Birds of the Photo Ark, with photos by Joel Sartore and text by Noah Strycker, is available ...