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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.
Average life span of heron?   Up to 25 years. an average flamingo will live for upto 40 years. the oldest recorded greater flamingo, which is the most common specie, is a resident at Adelaide Zoo in Australia and is at â¦least 75 years old. The average life span of a rat is 2 years to 5 years. The absolute minimum is 1 year and some people say rats live from 1 to 1.5 years old, but that isn't true. They live up tâ¦o 5 years depending on how well you take care of them and if they were born with a disease or got one.