Every few minutes, the quiet of a muggy spring evening in the Park Glen neighborhood in far north Fort Worth was broken by the clanging of pots, pans, air horns, and other noisemakers as residents looked skyward at unwanted guests.
These residents have gathered every night for the past few weeks to scare away migratory egrets and herons that seem to like the suburbs. The birds, federally protected by the Migratory Bird Treaty Act of 1918, have become yearly headaches for neighborhoods around the Metroplex as the birds flock to residential areas to nest…