13. Brown Rat
The brown rat is a model of urban adaptability and survival. Found in cities and countrysides across the globe, these clever rodents exhibit remarkable intelligence and resourcefulness.
Their rapid reproduction and growing resistance to many poisons have made them nearly impossible to eliminate. Brown rats can navigate complex environments, learning from experience and adapting to new threats.
If they ever united their efforts, brown rats could easily overwhelm human infrastructure and disrupt entire communities on a massive scale.
Source: Centers for Disease Control and Prevention