Tokyo Jungle -

: Since your animal lives for a limited time (roughly 15 "years"), you must mark territory to attract a mate and produce offspring.

: Even as a predator, you can easily be killed by larger animals. High-level predators like bears or tigers can often end a run with a single lunge. Tokyo Jungle

: Smog and rain can increase toxicity levels, which eventually drains health and kills plants. : Since your animal lives for a limited