How to make a nest?

Materials waste paper box, pen, ruler, meat cutter, scissors, glue, adhesive tape, kraft paper, rivets, plastic wrap, etc.

1. First of all, we should draw a simple picture with the skillful craftsman (what, if you can't draw, just use someone else's ready-made picture).

2. Get the cartons and tools ready, and we'll start. Take out the paper box, which is usually large, then open it and smooth it.

3. Draw the required parts of the bird's nest on the paper box according to the drawing. This can be enlarged, try to determine the size of the bird's nest by the size of the carton.

4. Then rivet the parts together with rivets or stick them together with glue.

5. Preliminary completion of the effect.

Bird's feather

What is a feather? There are three kinds: feather, down and hairiness. Feather branches are densely distributed on both sides (Figure 8), and there are hooks or grooves on the feather branches, and adjacent feather branches are hooked with each other to form a flat and elastic feather sheet. The positive feathers on the body surface form a windbreak shell, which makes the bird's body streamlined. Positive feathers on wings and tails play a decisive role in flight and balance. The structural characteristics of down feather are that the shaft of down feather is long and thin, and the hooked protrusions of down feather branchlets are underdeveloped, which can not form solid feathers and has the function of heat preservation. Duck down is duck down. Hairiness is very thin, like hair, mixed with normal feathers and down, which can only be seen after the normal feathers and down are removed.

Bird skin

The skin of birds has no sweat glands, and the only sebaceous gland is the tail sebaceous gland. The oil secreted by it is smeared on the feathers by the beak, which makes the feathers moist but not wet. The secretion of caudate finger gland also contains ergosterol, which can be converted into vitamin D under ultraviolet irradiation. When birds rub their feathers with their beaks, vitamin D can be absorbed by the skin, which is beneficial to the growth of bones.