The population reached its low point last century, with only about 30 individuals estimated to remain, external in the wild, and amur leopards are now the most critically endangered big cat species.
Their numbers have been affected by illegal hunting and trading, and damage to their forest habitats from climate change and global demand for wood and paper.
But, in the last two decades, conservation efforts have seen the subspecies’ territory increase threefold to about 2,350 square miles.
The Wildlife Foundation charity, which is based at Yorkshire Wildlife Park, supports the conservation of leopards.
This has included working with the WildCats Conservation Alliance to promote breeding, population monitoring and habitat protection.