As you doubtless know, however, some young birds, like young rooks and sparrows, thrushes and skylarks, when they leave the egg, are perfectly bare, blind, and helpless, and have to be fed and brooded by their mothers for a long time. Other young birds, like young owls, falcons (fig. 1), and hawks, also leave the egg blind and helpless, but their bodies are covered with long woolly down. Until quite recently no one could say why these differences should be, but at last we are beginning to see a way out of the puzzle. There seems to be no doubt that once upon a time the young of all birds left the shell in a fully active state, and clothed in down; further, we know that these early birds were reared in nurseries amid the tree-tops, and climbed about the branches by means of their legs and beaks, aided by claws in their wings, till at last their feathers grew and replaced the down, and they were able to fly. In course of time some birds took to building their nests on the ground, perhaps because so many young perished every year by falling from the trees. On the ground this danger was overcome. But, among those which chose to stay in the trees, a change was introduced. They took to laying smaller eggs, containing less food; in consequence, the young were hatched before they had reached such a forward state of development as their cousins on the ground; and though this meant far more work for the parents, who had to feed their helpless and blind little ones, the change proved beneficial, because, being helpless, they remained quietly in the nest till their feathers grew, and then they were in no danger of falling, for they saved themselves by flight. These two devices proved so successful that they are followed still—probably always will be. The fact that many young birds which are quite helpless are now reared in nurseries on the ground, as in the case of young skylarks (fig. 3), is a fact of interest; for it shows that the parents have chosen this nesting site comparatively recently, and are of course unable to lay large eggs, which shall produce active young, like young chickens, at will. They have acquired the habit, so to speak, of laying small eggs, and cannot alter it by changing their nesting-place.
Most young birds which leave the eggs in a forward condition have the down which clothes them curiously striped. This is a device which enables the young bird to resemble the grass and herbage with which it is surrounded, and so escape the eye of prowling birds and beasts of prey. The dark stripes at a little distance look like shadows between stems of plants, while the lighter stripes represent streaks of light passing through foliage. When young birds live in the open, as on shingly beaches, then their down is mottled. How perfectly this harmonises with the surrounding stones only those who have tried to find young terns (fig. 4), or young ringed plover (fig. 2), for example, can tell. But this question of young birds is a big one, and must be taken up again on some future occasion.
W. P. Pycraft, F.Z.S., A.L.S.
DR. JOHNSON'S BAD MANNERS.
When Dr. Johnson visited Scotland, he was taken, on his arrival at St. Andrews, to see the ruins of the castle there. He was sorry to find the grand old building, like many he had already visited, in ruins, and in his disappointment he was very rude and overbearing to those who were guiding him. One of the guides ventured to ask him if he had been disappointed in his visit to Scotland.
'Sir,' replied the doctor, 'I came to see savage men and savage manners, and I have not been disappointed.'
'Yes,' replied the Scotchman, 'and we came to meet a man without manners of any kind, and we have not been disappointed.'