"Very active flitty" Kinglet in the Backyard Garden. Both species of kinglets, golden-crowned, and this ruby-crowned, arrive back in the region in large numbers in early spring. You can hear them singing their very high-pitched song, so high-pitched in the case of the golden-crowned that it can be inaudible to some. The latter species occasionally overwinters in small numbers, but generally goes undetected. In spring, however, both species are incredibly active and Robert's description of them as "very active flitty" is right on the mark.