As they go on building, the mother bird gets inside and turns around and around to make it fit her form, and be smooth and comfortable for her to sit in.
When a nest is made, it must be lined. Then some birds go to the chicken yard, and pick up feathers, and others find horsehairs. Some of them pull off the soft down that grows on plants, or get bits of wool from the sheep pasture, or old leaves from the woods, and make it soft and warm inside.
Some bird homes are only platforms, where it seems as if the eggs must roll off, and others are deep burrows, or holes in the ground, where no one can get in. Some are dainty baskets hung between two twigs, and others are tiny cups of felt with lichens outside.
Each species of bird builds in its own way. There are as many different ways to make nests as there are kinds of birds to make them.
Then after all the trouble birds have taken to build a nest, they seldom use it a second time. If a pair have two broods in a season, they almost always build a new one for each family.
A few birds, such as eagles, owls, and sometimes orioles, and others, repair the home and use it again, and woodpeckers sometimes nest in the old holes. But generally, after the young birds have flown, we may be sure the nest will not be wanted again.
When the nest is finished, the eggs are laid in it, one by one. We all know how pretty birds' eggs are. Some are snowy white, some are delicate pink, and some blue. Many have tiny dots and specks on them, and a few are covered with queer-looking streaks and lines. But pretty as they are, I think no one would be so cruel as to take them away from the poor little mother, if he remembered that her young ones are inside them, and that she loves them as his own mother loves him.
I have heard people say that birds do not care for their eggs. Let me tell you what a little chickadee mother did when a man tried to steal the eggs out of her nest.
The nest was in a hole in an old stump, and the man could not get his hand in, so he had to take them out one at a time with a little scoop.
At first the mother flew at him and tried to drive him away. Then chickadees and other birds who lived near came to help her. All flew about his face with cries, so that he had to use one hand to keep them away from his eyes. But still he went on taking out the eggs.