Saber Tiger

Story 1: Saber Tiger
"From tens of millions of years ago, the saber-toothed tiger reigned as the strongest carnivorous animal on land." Told from the perspective of a saber-toothed tiger, Saber Tiger tells a story where time travelers appear in the mist of the Ice Age.

Story 2: The Planet of the Unicorn
Astronauts attempt to investigate a planet with environmental conditions frighteningly similar to that of the Earth's. Madness ensues.

(Source: MangaUpdates)