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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from On the Origin of Species by Charles Darwin: others singularly short tails. The barb is allied to the carrier, but,
instead of a very long beak, has a very short and very broad one. The
pouter has a much elongated body, wings, and legs; and its enormously
developed crop, which it glories in inflating, may well excite astonishment
and even laughter. The turbit has a very short and conical beak, with a
line of reversed feathers down the breast; and it has the habit of
continually expanding slightly the upper part of the oesophagus. The
Jacobin has the feathers so much reversed along the back of the neck that
they form a hood, and it has, proportionally to its size, much elongated
wing and tail feathers. The trumpeter and laugher, as their names express,
utter a very different coo from the other breeds. The fantail has thirty
 On the Origin of Species |