Smilodon, colloquially (and incorrectly) referred to as saber-toothed tigers, is an extinct genus of prehistoric mammals with exceptionally long upper canine teeth.
Smilodon existed during the Pleistocene epoch. Circa 768,000 BC, one such Smilodon was walking in a jungle, when it heard Time Bureau agent Gary Green's alarm behind some trees and prepared to attack when Gary and Nate Heywood, also a Time Bureau agent, escaped through their time courier.
Circa 8130 BC, Smilodon went extinct.
Another Smilodon, nicknamed Mr. Sneezums by Ray Palmer, was displaced in Wisconsin, 1870 after the Legends accidentally created a time storm. He was purchased by P.T. Barnum for his his traveling circus named Barnum's Roving Museum of Freaks and Hypnotic Hippodrome. The Legends eventually returned the anachronistic animal to its proper place in the timeline.