On Tuesday, Charles O’Connell, a retired Army sergeant, was walking on Pearl St. in Lower Manhattan headed to the post office, when a red-tailed hawk flew into a building and dropped to the sidewalk in front of him. He picked up the bird and carried it to Fire Department Engine Co. 6 on Beekman St. An animal rescue unit from the Battery Park City CERT (Community Emergency Response Team) transported the bird to an animal hospital. The hawk is expected to make a full recovery.