Elizabeth Ann is the first clone of a US endangered species. She was 33 years in the making

FOR THE FIRST TIME, SCIENTISTS HAVE CREATED a clone of an endangered US species – a black-footed ferret named Elizabeth Ann. The researchers used cells from a donor that had been dead for more than 30 years, and the procedure’s success could mean not only rescue for one of North America’s most endangered mammals, but a watershed moment in conservation biology.

After the donor ferret Willa died in 1988, scientists