From playful cubs to majestic adults, Siberian tigers at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, marked the International Tiger Day on Wednesday in their own style. While the cubs won hearts with their feisty charm, the adults cooled off together in the water. As the world's largest captive breeding base for Siberian tigers, the park reflects decades of conservation and breeding efforts in China's renowned "home of tigers."