|Home time period||Miocene - Pliocene epoch|
|Deaths caused|| Jaime Bairstow|
Numerous Special Forces soldiers
Peruvian villages of people
|Appearances||Shadow of the Jaguar|
Thylacosmilus has long, sabre-like upper canines and short, blunt, peg-like lower canines. The incisors are missing altogether and the other teeth are severely reduced, but, as distinct from machairods, their number is complete.
The Thylacosmilus under the Future Bird's control were described as being black and apparently resembled panthers. Thylacosmilus weighs around 75 - 160 kg, nearly the size of a modern jaguar, and is a marsupial.
A pack of six Thylacosmilus under the control of a Future Bird came through an Anomaly to a jungle in present day Peru. They proceeded to go on rampage, wiping out several villages, and killing Jaime Bairstow, a sloth and several members of the Special Forces.
The Thylacosmilus were followed by the ARC team and the accompanying Special Forces soldiers, and one was killed by the Special Forces and another was brutally killed by the Future Bird. At an Incan Temple, the team disrupted the Bird's control over the Thylacosmilus, and the pack were knocked out and subsequently returned through the Anomaly shortly before it closed.
- 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 Shadow of the Jaguar, when it real life Thylacosmilus was a marsupial.