Thumbs down to reports of hundreds of dead songbirds around Connecticut in July. Birds including blue jays, cardinals and finches had been dying mysteriously up the Eastern Seaboard and in the Midwest this spring, prompting Connecticut officials to urge people not to fill bird feeders, which they worried might help spread the mystery disease. Now the affliction has arrived in the state, and experts say they are puzzled. While some known illnesses have been ruled out, the cause of the ongoing deaths remains uncertain. In the meantime, residents are asked to refrain from filling feeders and birdbaths in hopes of cutting down on songbird congregation.