PARIS — Rats are increasingly scrambling from Paris sewers to the surface — and city officials and rat-catchers are scrambling for ways to get rid of them.
A creepy video of hundreds of rats wriggling in dumpsters published by Le Parisien newspaper put new pressure on authorities to act.
City hall says it has taken increasing measures against rats as their surface population has exploded in the past two years.
But Stephane Bras, spokesman for a group of extermination companies, said Monday the city’s efforts won’t work without national legislation requiring regular rodent inspection of all buildings and punishing picnickers who litter.
He said heavy rains in recent days, combined with a mild winter and an unusually large number of Paris construction sites, have driven more and more rats above ground.
For more information about how to control rats, contact EHS Pest.
Every trip Erma Jones makes to her garbage can, she’s greeted by a few unexpected, and unappreciated, guests.
“Oh yeah, they get into the house,” says Jones, who lives on Chicago’s South Side. “I got rat poison in different corners of the house. It works, but the idea of them coming in the house and dying in the house ... then you gotta search for them.”
Jones laughs it off but is quick to point out she never had this kind of rat problem when she lived in Mississippi.
And her observations are backed up by an annual list put out by the pest-control company Orkin, which often names Chicago America's rattiest city.
Chicago, like many cities, has struggled to find an effective way to control its rats. Right now, Chicago’s rodent control program relies heavily on poison, a tactic that rat expert Bobby Corrigan likens to putting a Band-Aid on a wound that needs surgery.
“You know, for probably 250 years, everyone thought the answer to getting rid of rats was simply put out a lot of bait, put out a lot of poison and kill as many as you can on regular basis,” Corrigan says. “We now know it’s much more complex than that."
It’s more complex because we’ve learned that rats are building up immunities to some poisons and a couple of rats, and their following generations, can produce up to 15,000 descendants a year. Plus, many rat experts, including Corrigan, are concerned global warming might be giving rats more opportunities to reproduce during the winters when they usually relax.
Now, new research suggests it might be better if — in some situations — we didn’t kill rats at all.
A research organization called the Vancouver Rat Project set up shop in one of the city’s rat havens in order to study how disease among rats spreads. After tagging rodents and tracking them over the course of a few months, the Vancouver Rat Project discovered that disruptions, like poison, might cause rats to desert their territory. In many cases, the poison forces the surviving rats in a colony to look for safer areas and potentially bring disease to new populations of healthy rats.
“Carriage of disease and pathogens by rats is intimately linked to their ecology,” says Kaylee Byers, a researcher for the project.
The seriousness of disease spread by rats is nothing to scoff at. The bubonic plague killed millions of Europeans during the “Black Death” of the 14th century. Fleas carried the disease, but historians blame the rapid spread of the plague on rats, which carried the fleas.
While Vancouver isn’t seeing anything as extreme as the "Black Death,” it is seeing rats with Leptospira, which, if spread to humans, could cause liver or kidney failure.
A new solution
One option that cities are considering is rat birth control (yes, you read that correctly). Cities put out birth control the same way they put out poison. Males that ingest it become infertile and females who take it reach menopause quicker. This causes rats to die of natural causes without giving birth to thousands of offspring.
New York City tried a pilot program where they set out the birth control in subway stations and saw enough positive results to launch another program last year. Chicago tried its own pilot program where the birth control is set near transfer stations.
Many in the rodent control research community — including Byers and Corrigan — believe this is a great way to reduce rodents over time. But Byers wonders how well cities and pest control services can convince residents to buy into this emerging strategy.
“If you’re a pest control professional and you indicate to a client that they have two options for pest control: The first is a rodenticide which will kill the rat instantly and the second is a birth control that will decrease the rat population over, say, four or five generations, that could be a really hard sell.”
There is no one tool that can fix rat issues. Poison, birth control, and techniques that limit rats’ access to food (like pet waste and garbage) need to be put into effect if we want to see a dramatic change in city rat populations. And some of these solutions require an eye toward the future, rather than a focus on instant gratification.
Street rats are one of the most universally despised creatures on the planet. Thinking about them makes many people’s skin crawl, and subway riders scream just being in their presence.
Those feelings aren’t totally unreasonable, though — rats are a really big problem. It’s estimated that they cause $19 billion of damage in the US every year, and they can carry some dangerous diseases. But what if our rat problems aren’t really their fault?
I walked around New York City’s Chinatown with rodentologist Bobby Corrigan, who showed me how human behavior enables rats to succeed.
Bobby says rats couldn’t proliferate if it weren’t for our bad behavior. Improper trash disposal, not maintaining our infrastructure, and not taking preventive measures are just a few ways that we allow these rodents to overrun our cities.
There are lots of things we can do to prevent the spread of rats, and New York City recently allocated $32 million to the fight. But Bobby says there is one thing that all humans can do to pitch in: “Be a smart mammal. Whatever you do with your trash, ask yourself: Can the rats get to it?”
To learn more on how to prevent the spread of rats, contact EHS Pest.
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