A TV station in the East Texas town of Tyler reports that hundreds more dead birds have been discovered along the sides of a highway bridge. This news adds fresh fuel to a growing conundrum over the cause of hundreds of thousands of avian deaths in localities thousands of miles apart. The station, KLTV, acknowledges that around 200 birds were found dead this morning on state highway 155. The birds, identified as American coots or mud-hens, are the first of this species to be cited in the recent spate of deaths. As with previous cases, the cause of death is...