It Appears To Me A Curious Circumstance, As
Showing The Fine Shades Of Difference In Habits, That Judging
From This
Latter respect alone, when I first saw this second
species, I thought it was different from the Maldonado kind.
Having
Afterwards procured a specimen, and comparing the
two without particular care, they appeared so very similar,
that I changed my opinion; but now Mr. Gould says that they
are certainly distinct; a conclusion in conformity with the
trifling difference of habit, of which, of course, he was not
aware.
The number, tameness, and disgusting habits of the
carrion-feeding hawks of South America make them
pre-eminently striking to any one accustomed only to the birds
of Northern Europe. In this list may be included four species
of the Caracara or Polyborus, the Turkey buzzard, the Gallinazo,
and the Condor. The Caracaras are, from their
structure, placed among the eagles: we shall soon see how
ill they become so high a rank. In their habits they well
supply the place of our carrion-crows, magpies, and ravens;
a tribe of birds widely distributed over the rest of the world,
but entirely absent in South America. To begin with the
Polyborus Brasiliensis: this is a common bird, and has a wide
geographical range; it is most numerous on the grassy savannahs
of La Plata (where it goes by the name of Carrancha),
and is far from unfrequent throughout the sterile plains of
Patagonia. In the desert between the rivers Negro and Colorado,
numbers constantly attend the line of road to devour
the carcasses of the exhausted animals which chance to
perish from fatigue and thirst. Although thus common in
these dry and open countries, and likewise on the arid shores
of the Pacific, it is nevertheless found inhabiting the damp
impervious forests of West Patagonia and Tierra del Fuego.
The Carranchas, together with the Chimango, constantly
attend in numbers the estancias and slaughtering-houses. If
an animal dies on the plain the Gallinazo commences the
feast, and then the two species of Polyborus pick the bones
clean. These birds, although thus commonly feeding together,
are far from being friends. When the Carrancha is
quietly seated on the branch of a tree or on the ground, the
Chimango often continues for a long time flying backwards
and forwards, up and down, in a semicircle, trying each time
at the bottom of the curve to strike its larger relative. The
Carrancha takes little notice, except by bobbing its head.
Although the Carranchas frequently assemble in numbers,
they are not gregarious; for in desert places they may be
seen solitary, or more commonly by pairs.
The Carranchas are said to be very crafty, and to steal
great numbers of eggs. They attempt, also, together with
the Chimango, to pick off the scabs from the sore backs of
horses and mules. The poor animal, on the one hand, with
its ears down and its back arched; and, on the other, the
hovering bird, eyeing at the distance of a yard the disgusting
morsel, form a picture, which has been described by Captain
Head with his own peculiar spirit and accuracy. These
false eagles most rarely kill any living bird or animal; and
their vulture-like, necrophagous habits are very evident to
any one who has fallen asleep on the desolate plains of
Patagonia, for when he wakes, he will see, on each surrounding
hillock, one of these birds patiently watching him with an
evil eye: it is a feature in the landscape of these countries,
which will be recognised by every one who has wandered
over them. If a party of men go out hunting with dogs
and horses, they will be accompanied, during the day, by
several of these attendants. After feeding, the uncovered
craw protrudes; at such times, and indeed generally, the
Carrancha is an inactive, tame, and cowardly bird. Its
flight is heavy and slow, like that of an English rook. It
seldom soars; but I have twice seen one at a great height
gliding through the air with much ease. It runs (in
contradistinction to hopping), but not quite so quickly as some
of its congeners. At times the Carrancha is noisy, but is
not generally so: its cry is loud, very harsh and peculiar, and
may be likened to the sound of the Spanish guttural g, followed
by a rough double r r; when uttering this cry it
elevates its head higher and higher, till at last, with its
beak wide open, the crown almost touches the lower part of
the back. This fact, which has been doubted, is quite true;
I have seen them several times with their heads backwards
in a completely inverted position. To these observations I
may add, on the high authority of Azara, that the Carrancha
feeds on worms, shells, slugs, grasshoppers, and frogs; that
it destroys young lambs by tearing the umbilical cord; and
that it pursues the Gallinazo, till that bird is compelled to
vomit up the carrion it may have recently gorged. Lastly,
Azara states that several Carranchas, five or six together,
will unite in chase of large birds, even such as herons. All
these facts show that it is a bird of very versatile habits and
considerable ingenuity.
The Polyborus Chimango is considerably smaller than the
last species. It is truly omnivorous, and will eat even bread;
and I was assured that it materially injures the potato crops
in Chiloe, by stocking up the roots when first planted. Of
all the carrion-feeders it is generally the last which leaves
the skeleton of a dead animal, and may often be seen within
the ribs of a cow or horse, like a bird in a cage. Another
species is the Polyborus Novae Zelandiae, which is exceedingly
common in the Falkland Islands. These birds in many
respects resemble in their habits the Carranchas. They live
on the flesh of dead animals and on marine productions; and
on the Ramirez rocks their whole sustenance must depend
on the sea.
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