The largest tiger species is the Siberian tiger (Panthera tigris altaica), also known as the Amur tiger. These magnificent creatures are primarily found in the forests of eastern Russia and parts of China. Siberian tigers are known to weigh between 400 to 600 pounds and can grow up to 10 feet in length, including their tail. They have thick fur and a layer of fat to insulate against cold climates. As apex predators, they play a critical role in maintaining the balance of their ecosystems. Conservation efforts are crucial to protect their dwindling populations due to habitat loss and poaching.