This Sparrow can hear quite as well as you can, Nat.

Now think, children, how many things we have found about this Sparrow's head that are quite like our own,--ears, eyes, nose, mouth, and tongue,--only there are no lips or teeth, because the horny beak, with its hard edges and sharp point, answers both for lips and teeth.

I want you to learn from this how many things are really alike in Bird People and House People, though they look so different at first sight.

When we come to the bird stories, you will find that birds differ very much among themselves in all these things.

I will show you all sorts of beaks, of different sizes and shapes.