Yes, rats will eat other dead rats. This behavior is well documented in both wild and captive populations, though it’s driven more by survival instinct than routine preference. Rats are opportunistic omnivores, meaning they’ll eat nearly anything available when hungry enough, including members of their own species.
Why Rats Eat Their Dead
Rats don’t seek out dead rats as a food source under normal conditions. When food is plentiful, they typically avoid carcasses and stick to their usual diet of grains, scraps, fruit, and whatever else they can scavenge. The behavior surfaces primarily when resources become scarce.
A dramatic example played out during the early months of the COVID-19 pandemic. When restaurants and businesses shut down across major U.S. cities, the sudden disappearance of garbage and food waste left urban rat populations desperate. The CDC issued warnings about increasingly aggressive rat behavior, and in cities like New York and New Orleans, rats were observed eating their own young and turning on each other. The lockdowns essentially removed the food supply that millions of urban rats depended on, and cannibalism followed quickly.
Beyond hunger, there’s a practical element. Rats instinctively recognize that a decaying body attracts predators and spreads disease. Consuming or partially consuming a dead companion may serve as a crude form of nest sanitation, reducing the smell and decay that could draw unwanted attention to a colony’s location.
What Happens With Pet Rats
One of the more distressing experiences for pet rat owners is discovering that a surviving rat has partially consumed a cage mate that died overnight. This is not aggression, and it doesn’t mean something is wrong with the surviving rat. It’s a deeply ingrained survival instinct that kicks in even when food is sitting in the bowl nearby.
In the wild, leaving a dead body in a nest is dangerous. Pet rats retain that instinct despite generations of domestication. The surviving rat isn’t being cruel or territorial. It’s responding to a biological signal that says “this body will attract threats, deal with it.” Owners who’ve experienced this often report feeling horrified, but experienced rat keepers consistently describe it as normal behavior that carries no ill intent.
If you keep multiple rats, the practical takeaway is simple: check on your animals regularly, especially if one has been ill or is elderly. Removing a deceased rat promptly prevents this scenario entirely.
Wild Rats and Scavenging Patterns
Brown rats, the most common species in cities worldwide, have what researchers describe as a “ferocious appetite” and a seemingly unlimited willingness to eat whatever sustains them. Their reputation as omnivores is well earned. They’ll consume meat, vegetables, paper, soap, and yes, other rats when the situation calls for it.
That said, a dead rat lying in the open doesn’t typically attract a swarm of other rats the way a food source would. Other rats generally avoid a carcass under normal circumstances, even though they’re still drawn to the same shelter and food sources that brought the dead rat to that location in the first place. The carcass itself isn’t a magnet, but finding one in your home or yard means the conditions that attract rats (accessible food, water, shelter) are still present.
Infanticide and cannibalism of pups is a somewhat separate behavior. Mother rats under extreme nutritional stress or those experiencing withdrawal from certain substances have been observed consuming their own young. Male rats sometimes kill and eat pups that aren’t their own, a behavior seen across many rodent species that serves a reproductive strategy rather than a nutritional one.
Risks From Eating Poisoned Carcasses
If you’re dealing with a rat problem and using poison, the possibility of rats eating poisoned carcasses introduces a real complication. Second-generation anticoagulant rodenticides, the most common type used in professional pest control, work by preventing blood clotting. A poisoned rat doesn’t die immediately. It continues feeding for several days before succumbing, which means its body can accumulate residues many times higher than a single lethal dose.
When another rat, or any scavenger, feeds on that carcass, it ingests those concentrated toxins. This is called secondary poisoning, and the EPA flags it as a significant hazard. It’s not just other rats at risk. Cats, dogs, owls, hawks, and other predators that eat poisoned rodents can absorb enough toxin to suffer serious harm or death. This cascading effect is one of the strongest arguments for removing dead rodents promptly after a poisoning program and for considering non-chemical control methods when possible.
Disease Concerns
Rat carcasses carry a long list of potential pathogens. Rats are known reservoirs for bacteria that cause food poisoning, kidney infections, and respiratory illness, along with parasites like toxoplasma and various viruses including hantaviruses. When one rat consumes another, those pathogens transfer directly, helping diseases circulate within a colony.
For humans, the risk isn’t from rats eating each other but from the broader disease ecology this behavior sustains. A rat colony where pathogens cycle through cannibalism maintains higher infection rates, which increases the chance of those diseases spilling over into human environments through droppings, urine, or contaminated surfaces. Prompt removal and safe disposal of any dead rat you find (using gloves and a sealed bag) reduces this risk in your immediate environment.