The extinction of the saber tooth tiger poses many questions and theories. The answer to why it became extinct could be due to changes in the environment or human interaction. Around the same time that this species died out, so did 15 others, which can't be a coincidence.
The last glacial period seems to have been different from others due to the drastic increase in temperature and the transformation of grasslands into forests. This affected the saber tooth tigers since that resulted in a change in ecosystems, for example, the Bison lived in grasslands. With its habitat dwindling, its numbers decreased and so the main source of food of the saber tooth tigers went away.
Some say that perhaps humans played a role in the extinction. At about the same time they became extinct, humans were beginning to hunt better thus maybe they were killing the tigers for sport or protection (but not food).
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Because they came 2 days right before the last Dinosaur died so they had meat for 31 years but they were meat eaters and they only had plants to eat so they starved to death still dont belive me I heard that from a scientist!!:]
I'm not sure but I think that it's prey like tapir and deer (I know that tapir and deer are Sumatran tiger's prey) would over populate like the deer here when wolves and other predators left.
The Sumatran tiger is not extinct, though endangered. Extinct tiger subspecies are the Caspian, Bali, and Javan...