July 23, 2026, 10:01 am | Read time: 6 minutes
For decades, the rumor has persisted that crocodiles live in the sewers of New York. Allegedly, they were flushed down the toilet as unwanted pets and grew into giant reptiles beneath the city. But what is the truth behind this famous urban legend? PETBOOK investigated whether crocodiles can actually survive in the sewers and where the myth originated.
Where did the legend of crocodiles in the sewers come from?
Stories about crocodiles in the sewers first appeared in the late 1920s and early 1930s. They specifically mention alligators. Alligators are a subgroup of crocodiles, along with true crocodiles and gharials, where the upper jaw is wider than the lower jaw. Incidentally, this is also the difference between an alligator (U-shaped snout) and a crocodile (V-shaped snout).
In the mid-20th century, baby alligators were a big hit in the pet market. Souvenir shops in Florida sold the animals in small aquariums. Tourists from New York City also bought the exotic reptiles to keep as pets.
Baby alligators were flushed down the toilet
Whether buyers were unaware that the animals would grow to enormous sizes or were misled by souvenir sellers is hard to say. Eventually, they either realized that even baby alligators could cause significant damage with their teeth or noticed that the pet quickly outgrew its aquarium–and later the bathtub.
Many disposed of the animals. If they were small enough, they were simply flushed down the toilet. Larger animals were likely released in parks. There were frequent reports of alligator sightings in unusual places, especially in New York City.1
This led to the legend that many of the “disposed” alligators survived in the sewers. There, they supposedly fed on rats and garbage and grew to enormous sizes. But is that even possible?
Can crocodiles survive in the sewers?
Even today, it is common to dispose of unwanted pets, especially fish, by flushing them down the toilet. Theoretically, a baby alligator could survive this. Once in the sewers, the animals initially find everything they need to survive: food, water, and shelter. In the long run, however, the sewers would be a certain death for crocodiles, and there are several reasons for this.
It’s too cold for crocodiles in the sewers
Crocodiles are cold-blooded animals. This means they cannot regulate their body heat like mammals and rely on external heat sources. In nature, they spend several hours a day basking in the sun. This would not be possible in the sewers.
If the reptiles do not get enough warmth, they fall into a kind of cold-induced torpor. While they can endure this for several months, without sunlight or other heat sources, they would ultimately die.
There is no food for crocodiles in the sewers
While baby alligators could theoretically still satisfy their hunger with rats, it would be more difficult for fully grown specimens. Normally, a crocodile eats about five percent of its body weight in a week. Alligators weigh between 100 and 200 kilograms and would need about 5 to 10 kilograms of meat per week. That would be about 25 to 50 rats.
Even though alligators generally eat anything that comes their way, fully grown specimens would likely seek larger prey. Aside from sewer workers, there is little else that would fit the reptiles’ prey profile. And even if there were, another problem would likely cause the animals to die quickly.
The city’s wastewater collects in the sewers. This is contaminated with pathogens such as E. coli, Shigella, or Salmonella. These also lead to severe poisoning in reptiles and ultimately to death.
Were there confirmed cases of crocodiles in the sewers?
Even though crocodiles do not survive long in the sewers, this does not mean that individual specimens have not occasionally wandered there. Especially after heavy rains and floods, it can happen that the animals enter the sewage system.
One of the most famous cases occurred on March 7, 1984, in Paris. Sewer workers discovered an unusual animal under the Rue du Pont-Neuf in the heart of the city and alerted the fire department. They captured a roughly 80-centimeter-long Nile crocodile, which had likely been abandoned by its owner. Experts at the time believed the reptile had survived in the sewers for one to two months, feeding on rats and waste. The animal was later named “Éléonore,” lived for decades in an aquarium in Brittany, and grew to over four meters in length.2
In 2017, alligators were also spotted in the drains and sewers of Florida, as many of the landfills empty into the swamps. During storm surges and in the colder winter months, alligators sometimes hide in the sewer pipes and hunt rats there.
In April 2023, a young alligator caused a stir when it was rescued from a pond in a park in Brooklyn, New York City, as reported by news outlets such as “CNN.” It was suspected to be an abandoned pet, as the animal was obviously mistreated and had several injuries. The reptile was handed over to the Bronx Zoo in New York City. Unfortunately, despite the staff’s great efforts, the alligator did not survive.
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Over 1.5-meter-long alligator in Florida sewer
While New York may not have the infamous sewer alligators, Florida seems to have them. The tabloid “New York Post” reported in May 2023 that a work crew in Oviedo, Florida, found an over 1.5-meter-long alligator living in a mud-filled pipe.
More precisely, a robot found the impressive reptile. It was sent to investigate the cause of repeated wastewater accumulation on the street above. Apparently, there was a blockage. Equipped with a camera, it encountered a Mississippi alligator–albeit a relatively small specimen, as the animals can grow up to six meters long.
The city administration of Oviedo assumed that the animal had entered the pipe through one of the stormwater ponds. These ponds are designed to prevent flooding during storms. The maintenance chief said they were just glad no one had encountered the “beast.”
Conclusion: Crocodiles in the sewers are isolated cases
There are certainly many fertile things to be found in the sewers–but crocodiles are not among them. Nevertheless, the stories of “sewer alligators” in New York City have almost become legendary. In the Manhattan borough, the animals even have a dedicated day: February 9 is officially “Alligators in the Sewers Day.”
Additionally, on October 22, 2023, a sculpture was unveiled in New York City in honor of the reptiles that supposedly lurk in the sewers. It serves as a homage to one of the city’s most persistent myths. The sculpture depicts a life-sized alligator wrapped around a New York City manhole cover and is titled “N.Y.C. Legend.” The work will be on display until June 2024.