When we observe the small heads and unmeaning eyes of birds, we do not expect to find any great amount of intellect among them. They are, however, moved by the same passions and feelings as larger animals, and occasionally exhibit thought and reasoning power. I suspect, indeed, could we understand their language, that we should find they can talk to each other, and express their meaning as well as others of the brute creation.
The following pages will deal with prominent features of their intelligence and psychology.
Why do birds sing? Has their music a meaning, or is it all a matter of blind impulse? Some bright morning in March, as you go out-of-doors, you are greeted by the notes of the first robin. Perched in a leafless tree, there he sits, facing the sun like a genuine fire-worshiper, and singing as though he would pour out his very soul. What is he thinking about? What spirit possesses him?...
Birds sing when they are happy, and cry out when they are frightened, just as children do. Only they have songs and cries of their own. You can always tell when the little song-birds are happy, for each one trills out his joyous notes as he sits on a branch of a tree, or the top of a hedge...
