According
To Azara, This Bird, Like The Cuckoo, Deposits Its Eggs
In Other Birds' Nests.
I was several times told by the country
people that there certainly is some bird having this
habit; and
My assistant in collecting, who is a very accurate
person, found a nest of the sparrow of this country (Zonotrichia
matutina), with one egg in it larger than the others,
and of a different colour and shape. In North America
there is another species of Molothrus (M. pecoris), which
has a similar cuckoo-like habit, and which is most closely
allied in every respect to the species from the Plata, even in
such trifling peculiarities as standing on the backs of cattle;
it differs only in being a little smaller, and in its plumage
and eggs being of a slightly different shade of colour. This
close agreement in structure and habits, in representative
species coming from opposite quarters of a great continent,
always strikes one as interesting, though of common
occurrence.
Mr. Swainson has well remarked, [8] that with the exception
of the Molothrus pecoris, to which must be added the
M. niger, the cuckoos are the only birds which can be called
truly parasitical; namely, such as "fasten themselves, as it
were, on another living animal, whose animal heat brings
their young into life, whose food they live upon, and whose
death would cause theirs during the period of infancy." It
is remarkable that some of the species, but not all, both of
the Cuckoo and Molothrus, should agree in this one strange
habit of their parasitical propagation, whilst opposed to each
other in almost every other habit: the molothrus, like our
starling, is eminently sociable, and lives on the open plains
without art or disguise: the cuckoo, as every one knows,
is a singularly shy bird; it frequents the most retired thickets,
and feeds on fruit and caterpillars. In structure also
these two genera are widely removed from each other.
Many theories, even phrenological theories, have been advanced
to explain the origin of the cuckoo laying its eggs in
other birds' nests. M. Prevost alone, I think, has thrown
light by his observations [9] on this puzzle: he finds that the
female cuckoo, which, according to most observers, lays at
least from four to six eggs, must pair with the male each time
after laying only one or two eggs. Now, if the cuckoo was
obliged to sit on her own eggs, she would either have to sit
on all together, and therefore leave those first laid so long,
that they probably would become addled; or she would have
to hatch separately each egg, or two eggs, as soon as laid:
but as the cuckoo stays a shorter time in this country than
any other migratory bird, she certainly would not have time
enough for the successive hatchings. Hence we can perceive
in the fact of the cuckoo pairing several times, and laying
her eggs at intervals, the cause of her depositing her eggs
in other birds' nests, and leaving them to the care of
foster-parents. I am strongly inclined to believe that this
view is correct, from having been independently led (as we
shall hereafter see) to an analogous conclusion with regard
to the South American ostrich, the females of which are
parasitical, if I may so express it, on each other; each
female laying several eggs in the nests of several other
females, and the male ostrich undertaking all the cares
of incubation, like the strange foster-parents with the
cuckoo.
I will mention only two other birds, which are very common,
and render themselves prominent from their habits.
The Saurophagus sulphuratus is typical of the great American
tribe of tyrant-flycatchers. In its structure it closely
approaches the true shrikes, but in its habits may be compared
to many birds. I have frequently observed it, hunting
a field, hovering over one spot like a hawk, and then proceeding
on to another. When seen thus suspended in the air,
it might very readily at a short distance be mistaken for one
of the Rapacious order; its stoop, however, is very inferior
in force and rapidity to that of a hawk. At other times
the Saurophagus haunts the neighbourhood of water, and
there, like a kingfisher, remaining stationary, it catches any
small fish which may come near the margin. These birds are
not unfrequently kept either in cages or in courtyards, with
their wings cut. They soon become tame, and are very
amusing from their cunning odd manners, which were
described to me as being similar to those of the common
magpie. Their flight is undulatory, for the weight of the
head and bill appears too great for the body. In the
evening the Saurophagus takes its stand on a bush, often
by the roadside, and continually repeats without a change
a shrill and rather agreeable cry, which somewhat resembles
articulate words: the Spaniards say it is like the words
"Bien te veo" (I see you well), and accordingly have given
it this name.
A mocking-bird (Mimus orpheus), called by the inhabitants
Calandria, is remarkable, from possessing a song far
superior to that of any other bird in the country: indeed, it
is nearly the only bird in South America which I have
observed to take its stand for the purpose of singing. The
song may be compared to that of the Sedge warbler, but
is more powerful; some harsh notes and some very high
ones, being mingled with a pleasant warbling. It is heard
only during the spring. At other times its cry is harsh and
far from harmonious. Near Maldonado these birds were
tame and bold; they constantly attended the country houses
in numbers, to pick the meat which was hung up on the posts
or walls: if any other small bird joined the feast, the
Calandria soon chased it away. On the wide uninhabited plains
of Patagonia another closely allied species, O. Patagonica
of d'Orbigny, which frequents the valleys clothed with
spiny bushes, is a wilder bird, and has a slightly different
tone of voice.
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