American Kestrel (Falco sparverius)
Walking around the lake at the Laguna Niguel Regional Park during my Christmas trip to California looking for birds (obviously :)), I noticed a Red-tailed Hawk (Buteo jamaicensis) hovering above the lake. So I pointed at it with my camera, hoping it would come close so I could take a few shots filling the frame more. But suddenly this American Kestrel (Falco sparverius) arrived and the two birds of prey got in a short quarrel. On the following shot which documents this moment, you can actually see the amazing difference of size between this two fantastic raptors.
The American Kestrel has a wingspan of 20 to 24 inches (50-60cm), where the Red-tailed Hawk has a wingspan of 43 to 57 inches (110-145cm)! I have realized that many people I talk to think of Kestrels as big birds of prey, but they are among the smallest raptors. I was really glad to live this moment and see an American Kestrel for the first time.