San Francisco Zoo has Siberian and Sumatran Tigers. All eight species of tiger are endangered, and three species are probably extinct. Estimates to the five remaining subspecies in the wild and captivity respectively (1999) are as follows: Bengal 4000/1000, Indochinese 1050/20, Sumatran 400/194, Siberian 400/632, and Chinese 30/40.

Siberian tigers are classified as endangered. A 1998 census estimated the wild population at about 350 to 400. There are more than 600 Siberian tigers living in captivity worldwide, over 200 in AZA Zoos in North America.

The wild Sumatran tiger population is now estimated at somewhere around 600.