. Bird lore . n on bird-song, including an article in this Department forMay-June, 1920, that we will pass oer it wth a word. The song-periodvaries vi-ith different species from those, Hke the Song Sparrow, that commencewith the first warm days of early spring and keep it up far into the moltingseason of August and September, to those, like the een. and Hermit Thrushes,that seldom waste a song untU the females arrive on the nesting-grounds.And these same birds usually cease singing soon after the eggs hatch, thoughthey are often heard from again upon the inspiration of a second brood. Some (
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. Bird lore . n on bird-song, including an article in this Department forMay-June, 1920, that we will pass oer it wth a word. The song-periodvaries vi-ith different species from those, Hke the Song Sparrow, that commencewith the first warm days of early spring and keep it up far into the moltingseason of August and September, to those, like the een. and Hermit Thrushes, that seldom waste a song untU the females arrive on the nesting-grounds.And these same birds usually cease singing soon after the eggs hatch, thoughthey are often heard from again upon the inspiration of a second brood. Some (167) i68 Bird - Lore birds, like the Meadowlark, the Yellowthroat, and the Ovenbird, have remark-able flight-songs which differ from their ordinary songs, and other birds, hkethe Black and White Warbler, sing, during the nesting-time, a song radicallydifferent from that used during migration. The interpretation of the differentsongs sung by birds is as difficult as it is fascinating and offers a rare field for. ROBIN SINGINGSong is the most conspicuous feature of the courtship of birds observation to those who have trained their ears to bird music and their mindsto the philosophy of evolution. The song of a bird is primarily an announcement to the female of thepresence of the male and a challenge to other males of his species to keep outof the territory which he is guarding. The male birds ordinarily precede thefemales on the northward flight, and, arriving on the breeding-grounds, proceed to select the territory in which the future nest is to be built and The Audubon Societies 169 over which they exert absolute dominion so far as their species is con-cerned, unless driven out by a more powerful bird. If any other male of hisspecies dares to intrude, he is immediately driven away. An amusing incident, illustrating this, took place in front of one of my windows, where I maintain afeeding-log, last spring. It seems that a certain male Song Sparrow haddecided to have a nest in an ad