This is mainly because Guangzhou is located in tropical and subtropical areas, with a humid climate and abundant food resources. These conditions provide a more suitable environment for rats to breed. In addition, urbanization and dense populations provide more habitat and food sources for rats.
In addition, many old residential and commercial buildings in Guangzhou may have poor building structures and sanitary conditions. Ideally, these factors may also provide more space for rats to live and breed.
As for the larger size of mice, it may be related to the abundance of food. Most mice are omnivores, and when food resources are abundant, they may have easier access to highly nutritious and high-protein foods, resulting in larger bodies.
