Here's why:
* Different Family: Saber-toothed cats (like the Smilodon) belong to the family Machairodontidae, while true tigers (like the Bengal tiger) belong to the family Felidae.
* Extinct: Saber-toothed cats are extinct, having died out thousands of years ago. True tigers are still alive today.
* Evolutionary Differences: While both groups are cats, they diverged from a common ancestor millions of years ago and evolved different characteristics. Saber-toothed cats are distinguished by their large, saber-like canines, while true tigers are known for their distinctive stripes and powerful build.
So, even though they share some similarities, the saber-toothed tiger is not a true tiger.