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Wild Rats. In the wild, the life expectancy for a rat is much lower: 95 percent of wild rats die before they reach their first birthday. A 1-year-old rat would be around 30 years old in human terms. The most common cause of death in wild rats comes from predators, such as owls, hawks and foxes.
The phenomenon is well known to dog lovers: Dogs from bigger breeds donât live as long as smaller ones. The small breeds have an average life expectancy of 12 to 14 years; for larger breeds, it's 8 to 10; and for the so-called âgiant breeds,â lifespan is 5 to 8 years. cat is going to live longer than a rat, youâre going to live longer than a cat and a Galapagos tortoise is going to live longer than you. The worldâs smallest mammal, the bumblebee bat, is thought to live 5 to 10 years, while the largest, the blue whale, lives for 80 to 90.