New York City is home to rats that most people will never see up close. These rodents live right alongside you in sidewalks, basements, subways, parks, and trash areas.
If you are asking what rats are in New York, the short answer is that the city’s population is dominated by brown rats. Black rats appear in the city’s history and in limited pockets.
A 2023 estimate put the number at about 3 million, according to Rats in New York City. Rats can spread illness through droppings, urine, saliva, and burrows.
The Main Rat Species You’ll Find In NYC
You will mostly encounter one dominant species. Another shows up more in the city’s past than in daily life.
Size, color, and habitat can help you tell them apart if you ever spot one moving along a curb or darting under a grate.
Brown Rats Dominate The City
The brown rat, also called Rattus norvegicus or the Norway rat, is the species most associated with New York. These rats are larger, heavier, and far more common than the city’s other rat species.
They tend to live near ground level, in basements, sewers, and trash-heavy blocks.
Black Rats In New York’s History
The black rat, also called Rattus rattus, ship rat, or roof rat, was more common in earlier city life. Over time, brown rats outcompeted them for food and shelter.
By the mid-20th century, brown rats became the dominant urban rat in New York City.
How To Tell Brown Rats And Black Rats Apart
Brown rats are thicker-bodied, usually brown or gray with a lighter belly, and often larger than black rats. Black rats are smaller, sleeker, and more likely to be associated with higher spaces.
People use the names roof rat and ship rat for black rats because of their habits.
Where They Live And How They Behave
Rats in the city follow food, shelter, and routine. Trash, hidden voids, and underground spaces give them easy access to meals and cover.
Their sounds and seasonal activity can reveal when they are most active.
Why Trash, Basements, Parks, And Subways Attract Rats
Rats need very little food and water to survive. Unsecured garbage, curbside waste, and restaurant trash attract them.
Basements, parks, subway areas, and building foundations provide nesting spots and reliable travel routes. These places are especially attractive where human food waste is easy to reach.
What Rat Vocalizations Reveal About City Life
Rat vocalizations, including ultrasonic squeaks that people cannot hear, help them communicate in noisy places like subway corridors. These sounds support social behavior and coordination around food and shelter.
How Weather And Seasons Affect Activity
Rat activity changes with climate and season. They respond to temperature, snow cover, and how much food is available outdoors.
Local conditions near the East River and other dense urban zones can shape where colonies concentrate.
Health Risks And What People Should Know
Rats can carry pathogens that affect people. The main risk comes from contamination rather than a quick sighting.
Droppings, urine, saliva, and disturbed burrows can expose you to germs if you clean up carelessly or touch contaminated surfaces.
Diseases Linked To Urban Rats
Urban rats may carry bacteria and viruses linked to gastrointestinal illness and fever, including salmonella, E. coli, and leptospirosis. Hantavirus is also a concern in some rat-related exposures.
Other infections can spread through contaminated waste or direct contact.
Why Contact With Droppings, Urine, And Burrows Matters
Rat droppings and urine can contaminate food, counters, and shared building spaces. Burrows can bring you close to nesting material and fleas.
If you see signs of rats, avoid disturbing the area and use proper sanitation and pest-control steps.
How NYC Tries To Reduce Rat Problems
New York City attacks the problem from several angles, from inspections to waste rules to targeted enforcement. The strategy focuses on where rats feed, where they travel, and how people’s trash habits make survival easier.
How Inspections And Rat Maps Track Hot Spots
City inspectors use complaint data and field observations to identify neighborhoods with repeated rat activity. Rat maps and inspection records help officials focus resources where trash, food access, and building conditions create the biggest problems.
The Role Of Kathleen Corradi And City Programs
Kathleen Corradi, the city’s rat czar, leads New York’s rodent response. Programs tied to her office and other agencies coordinate sanitation, enforcement, and public messaging more aggressively than older efforts.
Why Rat Mitigation Focuses On Food Waste And Access
Rat mitigation and rodent mitigation work best when you remove easy food sources and block entry points.
This approach means you need better trash storage and fewer curbside leaks.
You should also use sealed buildings and stricter handling of food waste, since rats in New York thrive when access is simple.
