How does cloning improve diversity?

Saving endangered species is vital for a healthy planet and cloning individual animals can help. Ellie and Laura look at the black-footed ferret, discuss some other endangered species that cloning is helping to save, and look at the history and challenges of cloning.
Fact check:

Cloning the black-footed ferret
Prairie dogs
A history of cloning
Controversy around claims of human cloning
Dolly the sheep
Endangered wild sheep in the Mediterranean