You may be thinking of the "Irish Elk" (Megaloceros giganteus), which was a large deer species that lived during the Pleistocene epoch, about 2.6 million to 11,700 years ago. However, it wasn't actually closely related to modern elk and did not have saber teeth.
Here's why the term is misleading:
* "Irish Elk" was actually a giant deer with massive antlers.
* Saber-tooth" refers to the long, curved canine teeth that are characteristic of some extinct predatory mammals like Smilodons.
Let me know if you have any more questions about prehistoric animals!