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