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Updated: May 31, 2025
One June morning, a year or two ago, I heard a loud squeaking, as of a young bird in the grass near my door, and, on approaching, discovered the spectacle of a cow-bird, almost full-fledged, being fed by its foster-mother, a chippy not more than half its size, and which was obliged to stand on tiptoe to cram the gullet of the parasite.
But either supposition is quickly dispelled as we further examine the nest; for in separating the upper compartment we have just caught a glimpse of what was, perhaps only yesterday, the hollow of a perfect nest; and, what is more to the point of my story, the hollow contains an egg perhaps two, in which case they will be very dissimilar, one of delicate white with faint spots of brown on its larger end, the putting of the warbler, the other much larger, with its greenish surface entirely speckled with brown, and which, if we have had any experience in bird-nesting, we immediately recognize as the mischievous token of the cow-bird.
Like the shadow of fate the cow-bird suddenly appears, and has doubtless soon ferreted out her cradle. In a certain grassy bank not far from where I am writing, at the foot of an unsuspecting fern, a song-sparrow has built her nest.
But sober second thought evoked a more philosophic and conscientious mood, the outcome of which leading, as always, to a semi-conviction that the complex question of reconciliation of duty and humanity in the premises was not thus easily disposed of, considering, as I was bound to do, the equal innocence of the chicks, both of which had been placed in the nest in obedience to a natural law, which in the case of the cow-bird was none the less a divine institution because I failed to understand it.
As he watched the awkward mud-coloured Cow-bird flutter its ungrown wings and beg help from the brilliant little Warbler, less than half its size, he wondered whether the fond mother really was fooled into thinking it her own young, or whether she did it simply out of compassion for the foundling. He now turned down creek to the lower mud album, and was puzzled by a new track like this.
We have one parasitical bird, the cow-bird, so-called because it walks about amid the grazing cattle and seizes the insects which their heavy tread sets going, which is an enemy of most of the smaller birds. It drops its egg in the nest of the song-sparrow, the social sparrow, the snow-bird, the vireos, and the wood-warblers, and as a rule it is the only egg in the nest that issues successfully.
These concert-singers, the little green and yellow field finch and the purple cow-bird, were with us all the year round, with many others which it would take a whole chapter to tell of. When, in July and August, I watched for the coming spring, it was the migrants, the birds that came annually to us from the far north, that chiefly attracted me.
For seven weary months he had wandered about New York's skyline, looking for just the right corner, as peevish as a cow-bird looking for a copse nest. Yet Mrs. Teetzel's laws were adamantine. Her rule was as Procrustean as her thin-lashed eyes were inquisitive.
The habits of the Molothrus bovariensis, a closely allied Argentine Cow-bird, have been carefully studied by Mr. W. H. Hudson, who has also some interesting remarks as to the vestiges of the nesting instinct in this interesting parasitical bird, which now is constantly dropping eggs in all sorts of places, even on the ground, most of them being lost.
There is no evidence to warrant a similar resource in our cow-bird, though the inference would often appear irresistible, did we not know that Wilson actually saw the cow-bird in the act of laying in the diminutive nest of a red-eyed vireo, and also in that of the bluebird. And what is the almost certain doom of the bird-home thus contaminated by the cow-bird?
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