* Panthera pardus (Leopard): The leopard is a large cat native to Africa and Asia. It is the smallest of the four "big cats" (lion, tiger, leopard, and jaguar). Leopards are solitary animals that typically prey on medium-sized animals such as antelopes, gazelles, and monkeys.
* Neofelis nebulosa (Clouded leopard): The clouded leopard is a medium-sized cat native to Southeast Asia. It is an arboreal species that spends most of its time in trees. Clouded leopards are excellent climbers and are known for their beautiful, clouded fur.
* Uncia uncia (Snow leopard): The snow leopard is a large cat native to the mountains of Central and South Asia. It is a rare and endangered species that is threatened by habitat loss and poaching. Snow leopards are well-adapted to living in cold, snowy environments and are known for their beautiful, thick fur.
These are just a few of the possible ancestors to the Amur tiger. The exact evolutionary history of the Amur tiger is still being studied and is a complex topic.