The birds have ovaries just the same as the flowers, and inside each
ovary are a number of little seeds or ovules which by and by will grow
into birdies. It takes quite a while for the ovules to ripen, just as it
took quite a while for the seeds to ripen, and when they are ripe they
must have a nest prepared for them, just as the flowers did. But the
birds are not as helpless as the flowers, and are able to make their own
nests. So when the ovules (which are called eggs when they are ripe) are
ready, the parent birds select a nice place for a home.
The father and mother work very hard until the nest is finished. Often
the mother will line it with some of her own feathers, so that it will
be soft and warm. After the nest is ready the mother bird lays the tiny
eggs in it. Then she must sit on them to keep them warm for many days,
for the eggs, like the seeds, cannot grow unless they are kept good and
warm. If we look at the eggs from day to day we will not be able to see
any change in them, but the change is inside the shell where we cannot
see it. Every day there is an alteration taking place, and the egg
gradually is being transformed into the little bird.
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