Xenosmilus hodsonae. Illustration and photo-reconstruction of two sabre-toothed cats, a male and a female, claiming their territory on the plains of North America. Xenosmilus is a genus of extinct Machairodontinae, or sabre-toothed cat. They lived about 1 million years ago, but as there are only two specimens of the same age, when they appeared and when they became extinct is unclear. Currently, there is only one species known, X. hodsonae. The cat measured between 1.7-1.8 metres long and had a highly muscular body, even more muscular than any other cat alive or dead. It probably weighed around 180-300 kilograms.