In my boyhood, an early morning-walk was one of my favorite recreations, and never can I forget those delightful matins that awaited me at every turn. Even then I wondered that so little admiration was expressed for the song of the Robin, who seemed to me to be worthy of the highest regard. The Robin, when reared in confinement, is one of the most affectionate and interesting of birds. His powers of song are likewise susceptible of great improvement. Though not prone to imitation, he may be taught to sing tunes, and to imitate the notes of other birds. I have heard one whistle "Over the water to Charlie" as well as it could be played with a fife. Indeed, this bird is so tractable, that I believe any well-directed efforts would never fail of teaching him to sing any simple melody. But what do we care about his power of learning artificial music? Even if he could be taught to perform like a _maestro_, this would not enhance his value as a minstrel of the woods. We are concerned with the birds only as they are in a state of nature. It is the simplicity of the songs of birds, as I have before remarked, that constitutes their principal charm; and were the Robins so changed in their nature as to relinquish their native notes, and sing only tunes hereafter, we should listen to them with as much indifference as to the whistling of boys in the streets. In the elms on Boston Common, and in all the lofty trees in the suburbs as well as in the country villages, are two little birds whose songs are heard daily and hourly, from the middle of May until the latter part of summer. These are the Warbling Fly-catchers (_Vireo gilvus and V. olivaceus_). The first is commonly designated as the Warbling Vireo, the second as the Red-eyed Vireo. The former arrives about a week or ten days earlier than the other, and becomes silent likewise at a somewhat earlier period. Both species are very similar in their habits, frequenting the villages in preference to the woods, singing at all hours of the day, particularly at noon, taking all their insect prey from the leaves and branches of trees, or seizing it as it flits by their perch, and amusing themselves, while thus employed, with oft-repeated fragments of song. Each builds a pensile nest, or places it in the fork of the slender branches of a tree. I have seen a nest of the Warbling Vireo placed less than fifteen feet from the ground, on a pear-tree, directly opposite the window of a chamber that was constantly occupied; but the nests of both species are usually suspended at a considerable height from the ground.