Why are there so few flies in Guangdong?

There may be the following reasons for the small number of flies in Guangdong:

1. Climatic factors: The weather in Guangdong is hot and humid in summer, which may be unfavorable for the survival and reproduction of flies.

2. Environmental sanitation: The environmental sanitation in most cities in Guangdong is relatively good, and the garbage disposal and sewage management are relatively standardized, which may reduce the chances of survival and reproduction of flies.

3. Ecosystem balance: Guangdong's natural environment and urban greening are relatively good, with more animals and plants, which helps to maintain the balance of the ecosystem, thus reducing the number of pests such as flies.

The above is only a speculative reason, for reference only. In addition, there may be differences in the number of flies in other parts of Guangdong, and the specific situation needs further investigation and analysis.