Washington, D.C. has a rat problem, and a group of local volunteers believes the most effective solution isn't poison or traps — it's educating the people who make the city so hospitable to rodents in the first place.
They call themselves Rat Rangers, and their mission is to show residents how their everyday habits contribute to a growing rat population. Rather than focusing on extermination alone, the group works to prevent infestations by teaching people how to make their neighborhoods less inviting to the animals.
The effort took root after a 2024 study by the organization City Wildlife found that a large number of D.C. wildlife tested positive for rodenticides, the poisons used to kill rats. Many of the affected animals showed signs of blood-clotting problems, a telltale consequence of exposure to these chemicals.
That finding raised alarm among wildlife advocates and helped spur the creation of the Rat Rangers, who offer an alternative approach: reducing the food and shelter that rats rely on, instead of relying on toxins that can harm other creatures.
On a recent weeknight in late September, two dozen D.C. residents gathered for one of the group's nighttime "rat walks," guided by head Rat Rangers Holly Gerberich and Gerard Brown. The pair wore matching t-shirts featuring a rat on the front as they led the group down a dimly lit alley.
Participants came equipped with head lamps and closed-toe shoes. According to the organizers, many also arrived wishing they had brought more mosquito spray — a small discomfort compared with what they were there to learn.
Gerberich, an anthrozoologist who studies the relationship between humans and animals, shared a striking statistic with the crowd: a single healthy pair of brown rats living in a city can produce as many as 15,000 descendants in one year. That reproductive capacity helps explain why rat numbers in Washington have continued to climb despite widespread use of poison, traps and even birth control methods.
The D.C. health department has acknowledged that the city's rat population is on the rise, a trend mirrored in other urban areas. But Gerberich argues that rats themselves are not the root of the problem — humans are.
She told the group that rats thrive in cities because people provide them with an ideal environment, complete with abundant food and hiding places. The central question, she said, is how residents can make their surroundings less welcoming to the animals.
The answer, according to Gerberich, lies in getting people to understand why they must stop leaving garbage and food waste out for rodents to eat. The most effective way to drive that lesson home, she believes, is to show people the problem up close, in the alleys and behind the trash bins where rats actually live.
That philosophy shapes the rat walks, which take interested residents through some of the capital's filthiest back alleys after dark. Participants peer behind trash cans and inspect old takeout containers, learning to see the urban landscape the way a rat does.
The approach reflects a broader shift in urban wildlife management, one that emphasizes prevention and public education over chemical control. Cities across the country have struggled with rodent infestations, and many have relied heavily on rodenticides despite concerns about their impact on hawks, owls, raccoons and other animals that eat poisoned rats.
In Washington, the Rat Rangers see their work as a complement to — not a replacement for — traditional pest control. By training humans to change their behavior, they hope to reduce the food supply that allows rat populations to explode in the first place.
For the residents who participate in the walks, the experience is designed to be memorable and a little uncomfortable. Seeing rats scurrying through alleys at night makes an impression that a pamphlet or a public service announcement cannot, organizers say.
The group's message is ultimately about responsibility. Every unsealed trash bag, every leftover container of food left outdoors, and every improperly maintained dumpster creates an opportunity for rats to feed and breed. Changing those habits, the Rangers argue, is something every resident can do.
Whether the effort will meaningfully reduce D.C.'s rat numbers remains to be seen, but the group's leaders say the goal is as much about changing human behavior as it is about shrinking the rodent population. In their view, a cleaner, more conscientious city benefits everyone — people and wildlife alike.
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