Material preparation: waste paper.

1. Do a good job, find some waste paper, roll it up one by one, and roll it into thin poles.

2. Splice the electrodes together in disorder.

3. Make the weeds and cut them into small pieces of paper with waste paper. The more messy, the finer the better.

4. Put the bracket on the messy paper, and the bird's nest will be ready.

The role of the bird's nest:

1, bird's nest can prevent eggs from rolling away and make them gather and pile up. For birds with large eggs, it is especially important to keep the eggs in a pile. If all the eggs are kept under the body of the mother bird, the embryo can develop at the temperature of the mother bird.

2. Bird's Nest is a good place for parents to feed their chicks and avoid enemies. Because many birds can nest in very hidden places, plus some camouflage, it is difficult for natural enemies to find their nests. Some birds make full use of their flight advantages to build their nests on cliffs or among tall branches, so that natural enemies can't find them even if they find them.

3. The Bird's Nest can keep the best temperature for the development of eggs and chickens. For the chicks of late birds, the body temperature is not constant in the first few days after hatching, and it is easy to change with the change of environmental temperature, so parents need to heat them as often as when incubating eggs, and the nest plays a role in slowing down the heat loss. For example, the tree cavity is higher than the ambient temperature 1℃ ~ 7℃.

4. Nesting behavior is beneficial to the reproductive behavior of birds. Nesting and nesting activities of birds are important factors to stimulate sexual and physiological activities of paired birds.

Especially when birds start to build nests or in nests, the signals from visual and tactile organs can promote the accelerated secretion of estrogen in the body through the synthesis of the brain, so that the eggs in the body can mature and be discharged quickly without interruption of reproductive behavior.

Many birds can't recognize their nests. As soon as they saw their nest, they went back to hatch their eggs. Even if the eggs in the nest are replaced with glass balls or stones, some birds will hatch eggs regardless. But if its nest is destroyed, the hatching behavior will stop immediately.