Rats Can Live 2 to 3 Years
Understanding the Rat Life Cycle
Rats are notorious for breeding quickly and frequently throughout their entire lives. Baby rats grow fast and are able to take care of themselves by week 3 and reach sexual maturity by week 5-9. By that time, female rats will have restarted the reproduction cycle and will typically have a litter of their own on the way. The reason this is extremely concerning is because rats in optimal conditions can live for 2 to 3 years while an average rat typically survives for one. Regardless of how long a rat survives, an adult rat can produce up to 6 litters a year with each litter having as many as 12 rat pups. Under these optimal circumstances, 2 rats can compound exponentially into well over a million rats in under a year. That being said, the survival and reproduction rates typically fall under those benchmarks, which under normal circumstances can still result in over 10,000 rats in a year resulting from just 2 original rat parents.
How Long Do Rats Live?
How long rats will live is extremely difficult to estimate but it usually dependent on factors like species, health, and access to food and shelter. Wild rats are open to predation and also have to fight off starvation, disease, and the elements. This usually limits wild rats' lifespans to about a year on average. Domesticated rats on the other hand, have typically been known to live for 2-4 times that because they are given what they need to survive comfortably and don't have to worry about predators like cats and birds.
Even the species of rat seems to have some impact on how long a rat survives. Brown rats average a little longer lifespan at 2 years while black rats typically live to 1 year. Since there are so many variables in play, it is difficult to say if the differences in lifespan are simply genetic or if they are a result of environmental impacts as brown and black rats tend to thrive in different habitats. Brown rats are commonly known as Norway or sewer rats and these rats tend to stay under cover and live-in burrows and sewers away from predators. Black rats are better known as tree or roof rats, and as their name implies, they live in high up places like tree branches and roofs. This exposes them to threats like predatory birds and cats which may impact their overall longevity.
Rat Life Cycle
Rats enter this world in litters with 6-11 brothers and sisters. They start off blind, bald, and unable to support themselves in any way, but they quickly grow into capable rats in a short period.
- Week 2: The babies open their eyes
- Week 3: They will be adolescents and venture out on their own for their first time
- Week 5 - 7: Rats will reach adulthood and be completely independent
- Week 8 - 12: Rats will reach sexual maturity and start having litters
Once rats reach sexual maturity, they will start cycling through litters every 2-3 months, producing between 6-12 babies in each litter. The full-term gestation period is roughly 21 days with a short period necessary to recover and breed before the next litter.
When Do Rats Reach Maturity?
Roof Rats
A roof rat typically becomes sexually mature between 2 - 3 months. Their litters are slightly smaller and less frequent, only producing between 4 - 8 pups 4 – 6 times a year. After the litter is born, roof rats can get pregnant again in less than 48 hours.
Norway Rats
Norway rats also generally reach sexual maturity by 3 months. The litter size is slightly larger than roof rats, with Norway rats producing between 8 – 12 pups roughly 4 – 7 times a year. Like roof rats, Norway rats can also come in heat and get pregnant all within a 2 day window after having a litter.
If resources are readily available and the environment is conducive to reproduction, rats will breed regularly as frequently as possible. However, for wild rats that do not have access to a secure source of food and shelter will most likely limit reproduction to spring and fall when most rodents seasonally procreate.
How Long Can Rats Live Without Food & Water?
The availability of resources has a big impact on the survival and procreation of rats and most rodents as well. Surviving situations where there are not enough resources can only last for so long before the rat ends up dying from hunger or dehydration.
How long can rats live without food?
Determining how long a rat can survive without food can be difficult but most rats can survive for roughly a week without food. Anything longer than that and the rat will most likely not be able to consume enough calories to survive. Before this time comes, rats will have become desperate and most likely will consume just about anything else available before starving.
It is also important to note that while food sources may be cut off, rats have been known to store food like squirrels and chipmunks so they may have reserves available to keep them alive through times of need.
How long can rats live without water?
Rats are small enough creatures that their need for water isn't too difficult to maintain. They are able to get most of their water through the foods they eat so they don't need to drink as much as they eat.
How Long Do Rats Live After Eating Poison?
Rats generally don't eat a rodenticide and die on the spot. The poisons typically work slow enough for the rat to wander off and die somewhere else completely. The speed at which they die is generally determined by the type of poison used.
- Anti-coagulants : Rodenticides like Warfarin and Fumarin are slow acting rat killers that work over the course of a couple days.
- Bromethalin : This rodenticide is a neurotoxin that attacks the liver and brain. It takes a couple hours after feeding on the rodenticide for the rat to expire.
- Vitamin-based : This method just causes an overdose of Vitamins A, D, E, K which take about a day to kill the rat.
It is important to keep in mind that most poisons take some time to take effect which means that a poisoned rat can make it into your home and die somewhere inaccessible. It is always recommended that baits are used outside only and that proper exclusion strategies have been implemented to minimize the chance of rodents moving inside to die. It is also important to remember that poisoned rats need to be removed and properly discarded whenever possible to avoid passing that poison on to an unsuspecting predator animal.
Rat Lifespan FAQs
Source: https://www.ecoguardpestmanagement.com/pest-resources/how-long-do-rats-live
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