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In 1987, 18 black-footed ferrets, the last known individuals of this species, were captured and brought into a captive breeding program in Wyoming. In 1989, the total ferret population, still in captivity, was 120 animals. Given r = (deltaN/deltat)/N1, and based on the numbers provided, the per capita growth rate (ferrets/year) from 1987 to 1989 was:102.60.51.25.5.2.83.
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