Birds can help control the number of pests and protect crops and forests.

2. Birds are important pollinators of plants, which can help plants to reproduce and maintain ecological balance.

Birds will eat the fruits and seeds of plants, help them spread seeds and promote their reproduction and growth.

4. The nesting activity of birds helps to kill the eggs and larvae of pests and reduce the number of pests.

Birds play an important role in the ecosystem and can be used as food for other animals to maintain ecological balance.

6. The existence and activities of birds help to maintain ecological balance and protect the environment.

7. The sound of birds and the color of feathers can add a beautiful landscape to the ecological environment and bring people visual and auditory pleasure.

8. Birds are cleaners of nature, which can help clean up dead animal and plant remains and reduce the spread of diseases.

9. The migration and reproduction of birds contribute to the genetic diversity and evolution of species.

10. Birds are important resources for people's leisure and entertainment, such as bird watching, hunting and fishing.

1 1. Birds play an important role in cultural inheritance, and there are bird images in many myths and legends and literary works.

Birds can help maintain the balance of the ecosystem, for example, swallows can help control the number of mosquitoes.

13. Birds can help monitor changes in environmental quality. Birds of prey such as vultures are very sensitive to air pollution.

14. Birds can be used as biological indicators for monitoring and evaluating environmental health.

15. Birds are an important teaching material for ecological education, which can help students better understand the ecosystem and environmental protection.

16, the existence and activities of birds help to maintain biodiversity, and protecting biodiversity means protecting the earth's home.

17, the song of birds can be used as a natural alarm clock to remind people of the passage of time.

18, the action of birds flying can stimulate people's artistic creation, such as dancing and painting.

19. Birds' feathers and eggshells can be used to make handicrafts and decorations.

Birds play an important role in ecotourism, and many nature reserves regard birds as one of the main attractions.