<human>:  Is an Eastern chipmunk likely to die before seeing two leap years?
<bot>: Yes, an Eastern chipmunk is likely to die before seeing two leap years. A leap year happens every four years, so the Eastern chipmunk has an average lifespan of three years. The Eastern chipmunk is likely to die before seeing two leap years, because the Eastern chipmunk has an average lifespan of three years, and a leap year happens every four years, so the Eastern chipmunk will die before then.