The correct answer is - The Siberian tiger is losing its habitat.
The Siberian tiger is an endangered species, and as of 2015, it has 562 individuals in Russia, there isn't accurate information about China. It is an animal that lives only the far east of Russia, and northeastern part of China. Even though there's lots of measures to protect the biggest cat in the world from extinction, the destruction of the habitat is still a huge problem, and if that is not solved soon, it can be fatal for the population of the Siberian tiger.