Checked the rapids at several spots below Violette's 7-8:30AM, no Arctic Tern. This morning, just as rare as Arctic Tern, was a dragonfly, the Midland Clubtail. This is a dragonfly that has become nearly extinct on the Potomac. Up until the 1960s it was common. Mysteriously, its numbers have dropped to almost nothing, while its close relative, the Cobra Clubtail has remained common, or even increased, on the piedmont section of the Potomac. This is only the second one I've seen in seven years of watching dragons on the river. The presence of this fresh individual indicates that the species is still breeding at this site. Dave