<P> In 2004, dramatic changes in land tenure, density, and reproductive output in the core area of the Sikhote - Alin Zapovednik Siberian Tiger Project were detected, suggesting that when tigers are well protected from human - induced mortality for long periods, the density of female adults may increase dramatically . When more adult females survived, the mothers shared their territories with their daughters once the daughters reached maturity . By 2007, density of tigers was estimated at 0.8 ± 0.4 tigers in 100 km (39 sq mi) in the southern part of Sikhote - Alin Zapovednik, and 0.6 ± 0.3 tigers in 100 km (39 sq mi) in the central part of the protected area . </P> <P> Siberian tigers mate at any time of the year . A female signals her receptiveness by leaving urine deposits and scratch marks on trees . She will spend 5 or 6 days with the male, during which she is receptive for three days . Gestation lasts from 3 to 31⁄2 months . Litter size is normally two or four cubs but there can be as many as six . The cubs are born blind in a sheltered den and are left alone when the female leaves to hunt for food . Cubs are divided equally between sexes at birth . However, by adulthood there are usually two to four females for every male . The female cubs remain with their mothers longer, and later they establish territories close to their original ranges . Males, on the other hand, travel unaccompanied and range farther earlier in their lives, making them more vulnerable to poachers and other tigers . </P> <P> However, Wildlife Conservation Society camera trapped an adult male and female Siberian tiger with three cubs . </P> <P> At 35 months of age, tigers are subadults . Males reach sexual maturity at the age of 48 to 60 months . </P>

What is the domain of a white tiger