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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Voyage of the Beagle by Charles Darwin: casarita, several of which I afterwards observed at work.
It is rather curious to find how incapable these birds must
be of acquiring any notion of thickness, for although they
were constantly flitting over the low wall, they continued
vainly to bore through it, thinking it an excellent bank for
their nests. I do not doubt that each bird, as often as it
came to daylight on the opposite side, was greatly surprised
at the marvellous fact.
I have already mentioned nearly all the mammalia common
in this country. Of armadilloes three species occur
namely, the Dasypus minutus or _pichy_, the D. villosus or
 The Voyage of the Beagle |