Young people readers will perhaps recall my previous reference to the
whims and preferences of the birds in their selection of building
material. The unravelling of deserted nests will often prove an
instructive as well as humorously entertaining pastime, revealing in
the same fabric evidences of great sagacity and what would appear
perfectly nonsensical prejudices, with an occasional piece of positive
frivolity. Thus we can readily see the wisdom in the selection of
these strong strips of milkweed bark with which this vireo's or
yellow-warbler's nest is moored to the forked branch, or the strands
of twine with which the Baltimore oriole suspends its deep swinging
hammock, as well as the plentiful meshing of horse-hair woven through
the body of the nest. The nest of the orchard oriole is even more
remarkable as a piece of woven texture. Wilson, the ornithologist, by
careful unravelling of a grass strand from one of these nests, found
it to have been passed through the fabric and returned thirty-four
times, the strand itself being only thirteen inches long, a fact which
prompted an old lady friend of his to ask "whether it would be
possible to teach the birds to darn stockings." The horse-hair in the
nest of the hang-bird gives it a wonderful compact strength, capable
of sustaining a hundred times the weight of the bird. Upon unravelling
one, I found it intermeshed fourteen times in the length of ten
inches, which would probably have given a total number of forty passes
in the full length of the hair. No one will question the sagacity
which such materials imply; but what is to be said of a bird that
selects caterpillar-skins as a conspicuous adornment for her domicile?
And here is a vireo's nest with a part of a toad-skin prominently
displayed on its exterior, or perhaps a specimen such as I have
previously described abundantly covered with snake-skins. These, of
course, are whims pure and simple.
In the linings of many nests we find an equal variety, but the
materials are selected with a definite purpose, a soft, warm bed for
the young fledglings being the object sought by the parent birds. To
this end we find many nests lined with what the ornithologists call
"soft downy substances." Examination with a magnifying glass will
sometimes show us precisely the nature of this down; whether it
consists of wool from a sheep or hair from the deer, 'coon, goat, or
horse; whether it is composed of fuzz from downy leaves or
spider-webs, caterpillar hairs, or cottony seeds of plants. These last
form a favorite nest lining with a number of birds.
I remember once finding a beautiful nest of a warbler whose outer wall
was strongly woven with strands of milk-weed bark, but the whole
interior filled with a felt composed of dandelion seeds, and barely
anything else. The nest was old and weather-beaten, and the mass had
been reduced to a consistency resembling thick brown paper, with an
occasional seed protruding. Originally this soft mass must have been
at least a quarter of an inch in thickness. The dandelion seed is an
occasional ingredient in many nests. We can readily understand how a
bird with an eye to a downy snuggery for her young might be tempted to
gather an occasional seed, but it takes a host of dandelion seeds to
make a thick cushion such as this which I have mentioned, and we might
well wonder at the labor involved in the accumulation of such a mass.
A cloudy dandelion ball in the grass doubtless looks inviting to the
nest-builder, but how much of this tuft would the bird be able to
secure in her bill when a mere touch or breath perhaps is sufficient
to scatter the ball to the breeze? No; I cannot believe my bird of the
dandelion nest wasted her energies in picking up a single seed here
and there from a dandelion ball, or perhaps on the wing. A discovery
of a few years ago has shown me how dandelion seeds may be cleverly
gathered by a shrewd nest-builder, and how a whole nest may be
feathered with them without much labor.
For some years I was puzzled to account for a peculiar mutilation
which I often observed on the dandelion. It was always at the same
place--the calyx of the blossom--the green portion which incloses the
bud, and, after blooming, closes again about the withered flower, and
so remains while the seeds are growing. Most of my readers have seen
dandelion flowers in all their stages of growth. The flower usually
blooms for three mornings. By this time all the tiny yellow flowerets
which make up the yellow cushion have bloomed. The green calyx now
closes, to remain closed, for a week, while the stem generally bends
outward, and thus draws the withered flower towards the ground, often
hiding it beneath the leaves.
During this week of retirement the stem continues to wither sideways,
and the flower is busy ripening its seeds, each yellow floweret having
a seed of its own, from which there grows a slender hair-like stalk
with a tiny feathered parachute at its top. Gradually these little
feathery ends push upward inside the calyx, and on the seventh day,
lo! the withered dandelion has appeared again at the top of the grass.
It now has a tiny brown cap at its top, or perhaps has just lost it,
and gives us a glimpse of a white feathery tuft peeping from its top.
This little brown withered cap is all that is left of the original
golden blossom of two weeks before, now a shrivelled mass, which has
gradually been pushed upward and out by the growing seed-tuft. In
another hour, perhaps, the calyx will again open, and bend down
against the stem, while the bed at the bottom to which the seeds are
attached will round upward through the feathers outward in the form of
a ball. This rounded seed-bed, or receptacle, as it is called in our
botany, shortly withers, and the winged parachutes take flight at the
slightest zephyr, whereas at first a smart breeze would have been
required.
Now all this is by-the-way, for not every one understands how the
dandelion ball is made. I know a little bird, however, who has found
it out to her advantage. I have just alluded to a certain mutilation
of this calyx which puzzled me. I have shown one of these calyxes in
my title picture, at the right, one-half of it being torn off, and
disclosing a cavity. Where are the seeds? "Ah! some rare caterpillar
has done this!" I exclaimed, when I first observed the burglary. In
vain I hunted among the leaves to find him. Again and again I found my
rifled dandelion, but never a sign of the burglar. But one day I
surprised him at his work. It was no caterpillar, but a tiny, black
bird with a beautiful rosy band in his tail, and which proved to be
that butterfly among the birds, the redstart. I hardly knew what he
was doing out there among the dandelions, and presumed he was after my
mysterious caterpillar, until I chanced to see him alight near by
with a white tuft in his bill. Yes, a tuft with feathery parachutes in
a bunch on one side of his bill, and a compact cluster of seeds on the
other.
In a moment I was among the dandelions from which he had flown, and
soon found my empty calyx, from which an entire dandelion ball had
been taken at one pinch. I lost no time in tracing out the nest in the
foot of an apple-tree close by. A dainty fabric it was, exquisitely
adorned with gray lichens and skeletonized leaves, its interior very
plentifully lined with the seeds of the dandelion, more so than is
usual with the nests of this bird. On two occasions since I have seen
other small birds of the warbler kind suspiciously rummaging among the
dandelions, and have afterwards discovered the empty calyx. There is
probably more than one dandelion burglar.