<h2><SPAN name="INTERESTING_FACTS_ABOUT_BIRDS" id="INTERESTING_FACTS_ABOUT_BIRDS"></SPAN> INTERESTING FACTS ABOUT BIRDS.</h2>
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<p class="drop-cap">SENSES of sight, smell, and
hearing are remarkably
acute in birds. This is
especially true of sight.
Some have three eye
lids, the upper and lower and a membrane
which can be drawn over the
entire eye-ball, called the nictitating
membrane, enabling them to look
directly at the sun. Eagles, Hawks,
and Owls are thus provided. The
eyes of the Eagles and Hawks are
provided also with a ring of bony
plates, by means of which the eye
adjusts itself like a telescope, taking
in both near and far objects.</p>
<p>Birds, except nocturnal species, have
no external ear, but hear well.</p>
<p>The young of nest building birds
when born are blind, naked, and unable
to walk. In the Hen, the Partridge, and
the Ducks, the young are able to walk,
swim, or pick up food, as soon as they
break the shell. When moulting, at
the close of the breeding season, Quails
usually shed in pairs. The male
generally assumes a duller hued coat
than the female.</p>
<p>With most birds of prey the female
is the larger.</p>
<p>Bird's songs are composed of love-notes
and pleasure-notes. We speak of
the scream of birds, their chirp, expressions
of joy or fear, as in the human voice.
Their songs can be set to music. See
S. P. Cheney's "Wood Notes Wild,"
in which the songs of many of our
common birds are thus reproduced.
The odd and peculiar actions of birds,
their dances, struts, and posturings
are all expressions of their emotions.</p>
<p>The nesting habits of birds are
varied. Gulls drop eggs on bare
ground or rocks; the Baltimore Oriole
and Tailor bird construct hanging
nests of elaborate workmanship; the
Woodpecker hews out a deep nest in
a rotten limb; the Kingfisher digs one
out of a sandy bank, while the Cuckoo
takes possession of the nest of some
other bird. Most birds select nesting
places away from other species, but
Swallows, English Sparrows, Grackles,
and Crows live in communities.</p>
<p>There are between seven and eight
thousand species of living birds.
A few species have become extinct,
specimens of which it is the
intention of <span class="sc">Birds</span> to present in future
numbers.</p>
<p>There are three centers of distribution
in the United States: (1) the Atlantic
states and Mississippi valley;
(2) the Rocky Mountain plateau; (3)
the Pacific coast.</p>
<p>Most of the birds breeding in the
northern portions of the United States
migrate south during the winter
months. Those remaining are known
as residents.</p>
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