The pictures come from a systematic camera-trap survey across the central Sahara.
It managed to identify four different Saharan cheetahs using spot patterns unique to each animal.
"The Saharan cheetah is critically endangered, yet virtually nothing is known about the population, so this new evidence, and the ongoing research work, is hugely significant," said ZSL's Dr Sarah Durant.
Farid Belbachir, who is running the field survey, added: "This is an incredibly rare and elusive subspecies of cheetah and current population estimates, which stand at less than 250 mature individuals, are based on guesswork.
"This study is helping us to turn a corner in our understanding, providing us with information about population numbers, movement and ecology."
Populations are said to be very fragmented and small
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