Thoreau writes in his journal:
There are a great marry birds now on the Island Neck. The red-eye, its clear loud song in bars continuously repeated and varied . . . There is also the warbling vireo, with its smooth-flowing, continuous, one-barred, shorter strain . . .
But what is that bird I hear much like the first part of the yellowbird’s strain, only two thirds as long and varied at end, and not so loud,—a-che che che, che-á, or tche tche tche, tche-a, or ah tche tche tche, chit-i-vet? It is very small, not timid, but incessantly changing its position on the pitch pines . . .