A baby boom has seen more than 50 furry tiger cubs born at the Heilongjiang Siberian Tiger Park in northeastern China so far this year. /Chinanews Photo

A rare set of tiny quintuplets were among the new arrivals. /Chinanews Photo

The Siberian tigers, an endangered species in the world, predominantly live in eastern Russia, with a small wild population in northeast China. /Chinanews Photo

The park, founded in 1986, is the world's largest breeding center for Siberian tigers. To save the species, China has launched captive breeding programs at the center. /Chinanews Photo