How Whipsnade Zoo bred rare cheetah cubs in captivity
27 September 2010 Last updated at 07:49 BST
The UK's first litter of Northern cheetah cubs born were born at Whipsnade Zoo recently, and their birth is largely due to a specially designed part of the animals' enclosure.
Built two years ago, the breeding facility, which members of the public cannot see, replicates how adult cheetahs would naturally find a mate in the wild.
The BBC went behind the scenes to see how it works.