Photo by Rohan Chang on Unsplash (illustrative)
On 25 September 2025, the Smithsonian's National Zoo and Conservation Biology Institute announced that three litters had been born at its Front Royal, Virginia, facility to the cloned black-footed ferret Antonia and to two of her offspring, Sibert and Red Cloud. A second clone, Noreen, also produced a litter in Colorado.
Key facts
Antonia was cloned from tissue taken in 1988 from a wild ferret named Willa and stored in San Diego Zoo Wildlife Alliance's Frozen Zoo.
Every other living black-footed ferret descends from just seven wild animals, so the species has very little genetic variety.
Willa's genes carry about three times more unique genetic variation than the average ferret alive today.
These are the first cloned endangered U.S. animals to reproduce, and their offspring are now breeding too.
Why it matters
Low genetic diversity leaves small populations vulnerable to disease and inbreeding. Passing a long-dead ferret's genes into new generations gives the recovery program a new tool for strengthening the species before more animals are released into the wild.
Worth noting
The first clone, Elizabeth Ann, could not breed, and both she and Noreen have since died. Ferrets in the wild still face sylvatic plague and canine distemper, and the cloned lines are so far bred in captivity.