Officials act after many hungry bison leave Yellowstone National Park in search of food.
Hunting and destruction of forests have eliminated all of Russia’s wild herds of the European bison, leaving only a few surviving animals in captivity.
With so few bison left, their gene pool has been weakened through inbreeding and the species is vulnerable to disease.
At breeding farms, like the Priokso-Terrasny Reserve south of Moscow, families are offered a rare chance to enjoy the ancient species.
Al Jazeera’s Robin Forestier-Walker reports from the Priokso-Terrasny Reserve, Russia.