(Portland, OR)  --  Portland city officials are hoping to reduce the number of crows loitering in the downtown area and alleviate the unsanitary messes they make.  Hawks and falcons are being released in downtown Portland as part of a four-week program that's being described as perhaps the first of its kind in an urban area.  Officials are hoping the trained raptors will scare away the crows and make the environment cleaner.  KOIN-TV reports the hawks and falcons were released yesterday.