What is the practical value of pigeons?

Carrier pigeons can deliver letters and serve the military and industry and commerce (especially in the military, there are many brilliant achievements, so I won't say it here); Can be used for scientific research and contribute to mankind; Be able to do earthquake prediction and reduce earthquake losses; Pigeons can be used to observe the weather and help people master the weather changes; Can enrich cultural and artistic life and provide materials for writing, painting and photography; Carrier pigeon competition is one of the international sports, and regular training of carrier pigeons is a good form of exercise. Pigeons are available for viewing, especially ornamental pigeons, which can enrich people's spiritual and cultural life; Pigeons are a symbol of peace and can participate in international exchanges and enhance people's friendship; Pigeons can participate in social activities, enhance the atmosphere of the venue and decorate the natural environment; All kinds of pigeons can be eaten to improve people's lives, especially meat pigeons, which have certain economic value and can be exchanged for the benefit of the country and the people.