After he and his mate have decided to go to housekeeping, they select a tree--a hollow-hearted or partly decayed one is preferred--and begin the hard work of cutting out a deep cavity. Try to draw freehand a circle by making a series of dots, as the woodpecker outlines his round front door, and see, if you please, whether you can make so perfect a ring. Downy's entrance need be only an inch and a half across; the hairy's must be a little larger, and the flicker requires a hole about four inches in diameter to admit his big body. Both mates work in turn at the nest hole. How the chips fly! Braced in position by stiff tail feathers and {194} clinging by his stout toes, the woodpecker keeps hammering and chiseling at his home more hours every day than a labour union would allow. Two inches of digging with his strong combination tool means a hard day's work. The hole usually runs straight in for a few inches, then curves downward into a pear-shaped chamber large enough for a comfortable nursery. A week or ten days may be spent by a couple in making it. The chips by which this good workman is known are left on the nursery floor, for woodpeckers do not pamper their babies with fine grasses, feathers or fur cradle linings, as the chickadee and some other birds do. A well-regulated woodpecker's nest contains five glossy-white eggs. Sheltered from the rain, wind and sun, hidden from almost every enemy except the red squirrel, woodpecker babies lie secure in their dark, warm nursery, with no excitement except the visits of their parents with a fat grub. Then how quickly they scramble up the walls toward the light and dinner! YELLOW-BELLIED SAPSUCKER This woodpecker I am sorry to introduce to you as the black sheep of his family, with scarcely a friend to speak a good word for him. {195} Murder is committed on his immensely useful relatives, who have the misfortune to look ever so little like him, simply because ignorant people's minds are firmly fixed in the belief that every woodpecker is a sapsucker, therefore a tree-killer, which only this miscreant is, and very rarely. The rest of the family who drill holes in a tree harmlessly, even beneficially, do so because they are probing for insects. The sapsucker alone drills rings or belts of holes for the sake of getting at the soft inner bark and drinking the sap that trickles from it.