Ok kiddo, have you heard of tigers? They are big cats with stripes that live in the forest? Well, there was a type of tiger called "Panthera tigris acutidens" long, long ago. It's like a special kind of tiger that lived a very long time ago, when there were different animals on earth.
This special kind of tiger was a bit different from the tigers we know today. It had some special features that made it unique. For example, it had really long teeth, called "canines," that were about 7 inches long! That's about the size of a banana! Can you imagine a tiger with teeth that big?
Sadly, these tigers don't exist anymore. They lived a long, long time ago, and now we only have the tigers we see today. But scientists still study these special tigers to learn more about them and their lives long ago. Who knows, maybe one day we'll find some more information about them that can teach us even more cool things.