http://www.nps.gov/brca/raven.html
Keen photos. Info new to me: “The raven’s ability to fly upside-down and defend itself with both claws and beak is enough to thwart even the fearsome dive-bombing attack of a Peregrine.”
Not so sure: “Ravens are found in almost every biome in North America, Europe, and Asia but tend to avoid large human populations and agricultural lands (environments crows tend to prefer).” Unless they are celebrity ravens who live in Hollywood.