What is the typical wild lifespan of rats and mice?

• A. Less Than 12 Months
• B. 2-3 Years
• C. 5-7 Years
• D. 6-12 Months

Answer: (A)

Rats and mice in the wild face many threats that keep their lifespan short: predators, disease, harsh weather, and fluctuating food supplies. Because of these conditions, most individuals don’t survive beyond the first year, so the typical wild lifespan is under 12 months. Some may reach around a year or a bit longer in favorable microenvironments, but that’s not common in the wild. In contrast, lifespans of 2–3 years or longer are more typical for animals kept as pets or in labs under controlled care. So, the best choice reflects the reality that wild rats and mice generally live less than a year.