There is one bird father who--it is thought--never comes to the nest, either to watch the eggs or to help feed the nestlings. That is our hummingbird, the ruby throat. We do not know the reason for this, and it is not fair to say hard things about him until we do. It may be that he thinks his shining ruby would show the hiding-place of the nest, or it may be that the little mother is not willing to have any help. I think this last is the real reason, for she has a great deal of spirit, and always drives away others from her feeding-places. Young birds grow very fast, and soon feathers begin to come out all over them. They are not very pretty at this time. V HOW HE IS FED SOON after the young bird comes out of the egg, he begins to be hungry. All day long, whenever the father or mother comes near, he opens his great mouth as wide as he can, to have it filled, and the moment he gets his voice he cries for food. Then the old birds have to work hard. Three or four hungry nestlings can keep both father and mother busy from morning till night, hunting for caterpillars and beetles and grubs and other things to feed them. It seems as if the little fellows never could get enough to eat. Each swallow baby wants seven or eight hundred small flies every day, and a baby robin needs more earthworms in a day than you can hold in your hand at once. At this time you will see robins hunting over the lawn, and carrying great beakfuls of worms up to the nest. Bluebirds you will find looking in the grass, and sparrows hopping about on the ground, all seeking soft worms and grubs and insects for the nestlings; and they are so busy they do not get much time for singing. [Illustration: RUBY-THROATED HUMMINGBIRD] At this time the orioles go all over the orchard trees looking for tiny worms, and little warblers seek them under every leaf. Woodpeckers find the insects hidden behind the bark of trees, by cutting holes through it. Chickadees and nuthatches pick the tiniest insect eggs out of the crevices, and flickers hunt everywhere for ants. As soon as one of the old birds has his mouth full, he flies to the nest to feed the young. But not all birds feed in the same way. A robin just drops a big earthworm, or a part of one, into the gaping baby mouth. Many other birds do so also. Sometimes, when an insect is too big or too hard, they beat it till it is soft, or break it up, before giving it to a little one. But hummingbird mothers and flicker mothers have a different way. When they collect the food they swallow it, as if they wanted it for themselves. Then they go to the nest, and jerk it up again in mouthfuls, and feed the nestlings. This is called feeding by "regurgitation," or "throwing up." The way they give the food is very curious. They push their long beaks into the nestling's throat, and poke the food far down; so the young one does not even have the trouble of swallowing.