After rebounding in recent decades due to conservation efforts, the number of once-imperiled peregrine falcons in the U.S. has been dropping again in some places due to the bird flu that has decimated other avian populations in recent years.
Although falcons in coastal parts of the country have been hit hard, researchers say others that set up camp in some of the country's biggest cities appear to be thriving, showing the world's fastest bird has acclimated to living among people. They're also amassing fans, as legions of devotees follow along on webcams each spring as the falcons progress from hatching to leaving the nest.
