FOOTNOTE: [5] See Appendix, 4. VI THE CAVE-DWELLING FAMILY (_Troglodytidæ_)[6] FIRST BRANCH THIS is a family of singers, who dress in plain colors. There is not a red or blue stripe, and not a yellow or purple feather, among them. The family has two branches, or subfamilies as the books call them. The first branch, which gives the name to the family, is made of birds who are really a sort of cave-dwellers,--the wrens. Wrens are lively little birds, excitable and afraid of nothing. They are in plain browns, barred off with another shade of the same color. They are so near the color of the ground, where they spend most of their time, that they are not easily seen. They have a way of holding their tails up, some of them much more than others, by which one may know a wren wherever he sees it. The most common one of the family is the HOUSE WREN. He is found all over the Eastern States. In the Western States the same bird, except in the shade of his coat, is called the Western House Wren. The house wren is fond of a snug place for a nest. If a wren box is to be had, he will take that; but if not, he will seek some cozy nook, which he will furnish, mostly with fine twigs, and then wait for his mate to appear. Sometimes the bird takes queer places to live in. I once found a wren family inside a hollow iron hitching-post in a city street. The birds went in through the hole for the hitching-strap. I wondered how the wrenlings would get out through the long, dark passage. Another nest was made in an oriole's hanging cradle, after the young orioles had flown. It was filled up with sticks to make it suitable for baby wrens. One that I found last summer was in a hole in a gate-post. The place is usually chosen by the male, who stuffs it full of fine twigs, and then sings and calls for his mate to come. He will sing hour after hour his sweet little song, stopping every few minutes to bring another stick to add to his store. The wren is a droll fellow about one thing,--he never knows when he has enough furniture for his house. He will bring twigs and stuff them into the box or hole, till he can't get another one in. Sometimes even till his mate can't get in herself. A pair began to build in a shed room, and apparently set out to fill the whole room with twigs. They brought in so much stuff that the owner had to stop up the hole they used for a door and make them go somewhere else. He was willing to share the room with them, but he couldn't spare the whole. The house wren is a plucky little fellow, and as he likes the same kind of places the English sparrow wants, they often quarrel over a box or a nice snug hole. Small as he is, the wren often succeeds in keeping the place he wants, and driving the sparrow away.