The Tropical World: Aspects of man and nature in the equatorial regions of the globe.Hartwig, G. (Georg)
History
The Tropical World: Aspects of man and nature in the equatorial regions of the globe.
Hartwig, G. (Georg)
Natural history -- Tropics; Tropics
The Talegalla or Brush-turkey is a no less interesting Australian
bird. In appearance it is very like the common black turkey, but is
not quite so large: the extraordinary manner in which its eggs are
hatched constitutes its singularity. It collects together a great heap
of decaying vegetables as the place of deposit of its eggs, thus making
a hot-bed, arising from the decomposition of the collected matter,
by the heat of which the young are hatched. This mound varies in
quantity from two to four cartloads, and is of a perfectly pyramidical
form: it is not, however, the work of a single pair of birds, but the
result of the united labour of many, and the same site appears to be
resorted to for several years in succession. ‘The mode,’ says Mr.
Gould, ‘in which the materials composing these mounds are accumulated
is equally singular, the bird never using its bill, but always grasping
a quantity in its foot, throwing it backwards to one common centre,
and thus clearing the surface of the ground to a considerable distance
so completely that scarcely a leaf or blade of grass is left.’ The
heap being accumulated and time allowed for a sufficient heat to be
engendered, the eggs, each measuring not less than four inches in
length--an enormous size, considering the bulk of the bird--are
deposited, not side by side, as is ordinarily the case, but planted at
the distance of nine or twelve inches from each other, and buried at
nearly an arm’s depth perfectly upright, with the large end upwards;
they are covered up as they are laid, and allowed to remain until
hatched. After six weeks of burial, the eggs, in succession and without
any warning, give up their chicks--not feeble, but full-fledged and
strong, so that at night they scrape holes for themselves, and lying
down therein are covered over by the old birds and thus remain until
morning. The extraordinary strength of the newly-hatched birds is
accounted for by the size of the shell, since in so large a space
it is reasonable to suppose that the young ones would be much more
developed than is usually found in eggs of smaller dimensions. Other
Australian birds, such as the Jungle-fowl (_Megapodius tumulus_),
Duperrey’s Megapodius (_M. Duperreyii_), which inhabits the forests
of New Guinea, and the Leipoas or native pheasants, construct similar
mound-like nests. Those of the jungle-fowl, observed at Port Essington,
are described as fifteen feet high, and sixty in circumference at the
base, and so enveloped in thickly foliaged trees as to preclude the
possibility of the sun’s rays reaching any part of it.
Public-domain text, read in full here on John Shaqi.
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