Cassell's book of birds; vol. 1Brehm, Alfred Edmund
Science
Cassell's book of birds; vol. 1
Brehm, Alfred Edmund
Birds
and pine, in order to obtain the hidden seed. The bird perches upon a
cone with its head downwards, or lays it upon a branch, and stands upon
it, holding it fast with its sharp, strong, pointed claws. Sometimes it
will bite off the cone and carry it to a neighbouring bough, or fly with
great difficulty some ten or twenty paces to another tree where it can be
opened, for a suitable spot is not to be found on every branch. If the
cone is large, the little creature tears its way through the middle of
the outside with its upper mandible, inserts its half-opened beak, and
forces an opening by a sideway motion of the jaws; it is then easy for
it to pick out the seeds, which are soon swallowed. The breaking up of
the husks produces a cracking sound, that is heard very distinctly from
below. The cones are seldom completely emptied of their seeds, but are
thrown down to the ground when scarcely touched, or not more than half
cleared, so that the grass beneath the trees on which a party of these
creatures has been perched is often completely strewn with them. When,
however, there are no more to be gathered, the birds will seek and feed
upon those they have previously flung away. The Pine Cross-bill seldom
touches the far harder cones of other fir-trees, as it does not possess
strength sufficient to open them, though the Large-beaked species breaks
them without difficulty, and can at one stroke tear off all the husks
into the midst of which it has plunged its beak. A cone is thus rifled of
its contents in the space of two minutes, when it is immediately thrown
down and another taken. Should the Cross-bill not be disturbed, it will
remain for hours upon the same tree, and continue for weeks together in
one part of the country. As long as fir-cones can be found, it seems not
to care for other food; but if driven by hunger it will eat oily seeds
such as those of the hemp or thistle, or even insects, seeking for them
in the neighbouring gardens and orchards. These birds are cleanly in
their habits, preening themselves carefully after every meal, and rubbing
their beak for minutes at a time upon the branches, in order to cleanse
it. Still, it is not always possible for them to keep their plumage trim,
and their feathers are frequently covered with a coating of resin. The
feeding of the Cross-bills on the fir-cones has another very remarkable
result. Their flesh becomes so penetrated with resin that it will resist
putrefaction for a lengthened period. It acquires by exposure a peculiar
smell, but cannot be said to decay. We have made many experiments upon
this subject, and always with the same result; there is a specimen now
lying before us, which was shot during the extreme heat of last summer,
and still retains its feathers. We have even seen a mummy of this bird
which was twenty years old. That the resin imbibed is the only cause of
this peculiarity is proved by the fact that specimens which have lived
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