THE Vireos are a family of singers and are more often heard than seen, but the Warbler has a much more musical voice, and of greater compass than any other member of the family. The song ripples like a brook, floating down from the leafiest tree-tops. It is not much to look at, being quite plainly dressed in contrast with the red-eyed cousin, the largest of the Vireos. In nesting time it prefers seclusion, though in the spring and mid-summer, when the little ones have flown, and nesting cares have ceased, it frequents the garden, singing in the elms and birches, and other tall trees. It rambles as well through the foliage of trees in open woodland, in parks, and in those along the banks of streams, where it diligently searches the under side of leaves and branches for insect life, "in that near-sighted way peculiar to the tribe." It is a very stoic among birds, and seems never surprised at anything, "even at the loud report of a gun, with the shot rattling about it in the branches, and, if uninjured, it will stand for a moment unconcerned, or move along, peering on every side amongst the foliage, warbling its tender, liquid strains."

The nest of this species is like that of the Red-eyed Vireo — a strong, durable, basket-like fabric, made of bark strips, lined with fine grasses. It is suspended by the brim in slender, horizontal forks of branches, at a great height from the ground.

The Vireo is especially numerous among the elms of Boston Common, where at almost any hour of the day, from early in the month of May, until long after summer has gone, may be heard the prolonged notes of the Warbling species, which was an especial favorite of Dr. Thomas M. Brewer, author of "History of North American Birds." Its voice is not powerful, but its melody, it is said, is flute-like and tender, and its song is perhaps characterized more by its air of happy contentment, than by any other special quality. No writer on birds has grown enthusiastic on the subject, and Bradford Torrey alone among them does it scant justice, when he says this Vireo "is admirably named; there is no one of our birds that can more properly be said to warble. He keeps further from the ground than the others, and shows a strong preference for the elms of village streets, out of which his delicious music drops upon the ears of all passers underneath. How many of them hear it and thank the singer, is unhappily another question."