A cheetah sanctuary in the US has seen a boom in the wild cats' population with the birth of 10 new cubs.
The population increase is a big boost for scientists who are working to save the animal from extinction.
In the wild, cheetah numbers are quickly dwindling which has led to scientists at the Smithsonian Conservation Biology Institute in the United States to act.
Biologist Adrienne Crosier says it can sometimes be hard to work with the world's fastest animal.
"Some are a little more feisty, some are a little more laid back," she says.
"Part of what I do -- is to try to make the best genetic matches but also the best matches based on individual temperament."
Scientists put the decreasing numbers down to human intrusion into cheetah's natural habitat.