A Siberian tiger at a Chinese breeding center gave birth to quintuplets a month ago, and now the tiny cubs are being introduced to the world. Tiger quintuplets are extremely rare. Most Siberian tigers give birth to two to four cubs at a time. Their mother didn't take to them, so the breeders have been raising the cubs. They feed them by hand every day. The center estimates a record high of 150 cubs will be born this year. That's good news for them as Siberian tigers are an endangered species.