But who can tell what the other three children, who had not cracked the shell, were thinking? Could they remember the time when they began to be? Could they dream of what would happen after they were hatched? Could they think at all? They were tiny, weak creatures, curled up within their shells, with food packed all around them. There had been a time when they were only streaks in the yellow liquid of the eggs. Now they were almost ready to leave this for a fuller, freer life, where they could open their bills and flutter their wings, and stretch their legs and necks. It had been a quiet, sheltered time in the shell; why should they leave it? Ah, but they must leave it, for they were healthy and growing, and when they had done so, they would forget all about it. By the time they could talk, and that would be very soon, they would have forgotten all that happened before they were hatched. That is why you can never get a bird to tell you what he thought about while in the egg. After the young Woodpecker's three sisters reached the outside world, the father and mother were kept busy hunting food for them, and they were alone much of the time. It was not long before they knew their parents' voices, although, once in a while, before they got their eyes open, they mistook the call of the Tree Frog below for that of the Woodpeckers. And this was not strange, for each says, "Ker-r-ruck! Ker-r-ruck!" and when the Tree Frog was singing in his home at the foot of the tree, the four Woodpecker children, in their nest-hollow far above his head, would be opening their bills and stretching their necks, and wondering why no juicy and delicious morsel was dropped down their throats. When they had their eyes open there was much to be seen. At least, they thought so. Was there not the hollow in their dear, dry old tree, a hollow four or five times as high as they could reach? Their mother had told them how their father and she had dug it out with their sharp, strong bills, making it roomy at the bottom, and leaving a doorway at the top just large enough for them to pass through. Part of the chips they had taken away, as the mother had taken the broken shells, and part had been left in the bottom of the hollow for the children to lie on. "I don't believe in grass, hair, and down, as a bed for children," their father had said. "Nice soft chips are far better." And the Woodpecker children liked the chips, and played with them, and pretended that they were grubs to be caught with their long and bony tongues; only of course they never swallowed them. It was an exciting time when their feathers began to grow. Until then they had been clothed in down; but now the tiny quills came pricking through their skin, and it was not so pleasant to snuggle up to each other as it had once been. Now, too, the eldest of the family began to show a great fault. He was very vain. You can imagine how sorry his parents were.