The
thrush also changes its colour; about the throat it is marked in
winter with speckles like a starling, in summer distinctly spotted:
however, it never alters its note. The nightingale, when the hills are
taking on verdure, sings continually for fifteen days and fifteen
nights; afterwards it sings, but not continuously. As summer
advances it has a different song, not so varied as before, nor so
deep, nor so intricately modulated, but simple; it also changes its
colour, and in Italy about this season it goes by a different name. It
goes into hiding, and is consequently visible only for a brief period.
The erithacus (or redbreast) and the so-called redstart change into
one another; the former is a winter bird, the latter a summer one, and
the difference between them is practically limited to the coloration
of their plumage. In the same way with the beccafico and the blackcap;
these change into one another. The beccafico appears about autumn, and
the blackcap as soon as autumn has ended. These birds, also, differ
from one another only in colour and note; that these birds, two in
name, are one in reality is proved by the fact that at the period when
the change is in progress each one has been seen with the change as
yet incomplete.
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