For years, researchers have debated the number of tiger subspecies. In 2004, Shu-Jin Luo, now at the University of Peking, and colleagues proposed that there were six, based on an analysis of several ...

Females weigh, on average, up to 260 pounds, according to the Philadelphia Zoo. The smallest tiger subspecies, the Sumatran ...

Neither tiger have produced cubs before ... and Malayan tigers are the second smallest subspecies. Although the zoo has been attempting to breed Malayan tigers for around a decade, they have ...