Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to raise baby birds [title] Create a nest box. [step] If you are breeding birds, you should create a nest box before the female is ready to lay her eggs. Any wood box that is wide enough for the birds to turn around in and deep enough that the adults will not be able to kick all of the nesting material out of the box will do.

Ending1: [substeps] Dump or throw out out any wood or higher materials stored in the box. This includes anything that will lump up and grow over time. Ending2: [substeps] Nesting boxes can be wood or metal. Wood provides more warmth, but metal is easier to clean. Ending3: [substeps] Situate some grain paper atop the box so that it will not look like a nest box lid. This can be an oatmeal bathtub, a nesting box, and so forth. Ending4: Be sure to fill it as full as possible, not empty. [substeps] Clear and waterproof boxes will usually work best for the females so that the young birds do not get soiled, along with the eggs and all the birthing materials.

Answer format: ending1/ending2/ending3/ending4