Thylacosmilus had long, sabre-like upper canines and short, blunt, peg-like lower jaw bone. They were described as having black muscled skin (resembling panthers) and had yellow eyes that reflected red. Thylacosmilus apparently also often hunted in packs, and seemed to be stalkers which would slowly close in from the cover of darkness upon prey.
Incursions and encounters
A pack of six Thylacosmilus under the control of a Future Bird came through an Anomaly to a jungle in Peru in the present. They proceeded to go on rampage, wiping out several villages. They were also responsible for killing Jaime Bairstow and a sloth.
The Thylacosmilus were tracked and followed in the jungle by the Anomaly Research Centre team and the accompanying Special Forces soldiers. One Thylacosmilus was killed by Sean Lucas just after it fatally wounded Andy Blaine. At an Incan temple, the team disrupted the Bird's control over the Thylacosmilus and the bird brutally killed one, and the pack were knocked out and subsequently returned through the Anomaly shortly before it closed.
Thylacosmilus lived in South America from the Late Miocene to Late Pliocene epochs. It is thought to have had a weak bite but strong muscles in the neck and limb regions, suggesting it relied upon immobilisation and precise bites to kill its prey rather than powerful, crushing bites. Thylacosmilus is also counted as a "sabre-toothed cat," although it was not an actual cat and only resembled them due to convergent evolution. Thylacosmilus fossils have been found in multiple provinces in northern Argentina.
- The image of the Thylacosmilus on the cover of Shadow of the Jaguar is actually that of the Smilodon from Episode 2.3, although it is edited to make it look darker. Incidentally, Shadow of the Jaguar takes place between Episode 2.3 and The Lost Island.
- Thylacosmilus was referred to as a type of cat in Shadow of the Jaguar, when in real life Thylacosmilus was a marsupial.