The Martian Frogmen. Their story takes place in an AU of C. M. Koseman’s All Tomorrows (Spoiler due to non-sexual nudity)

During the Qu’s occupation of Earth and Mars, they brought some of Earth’s life forms onto Mars. After the Qu left, they simply left behind all life forms of Earth and Mars and didn’t care about them anymore.

A species of Amphibian, which is currently mostly lost to time, was used by the Qu as pets. The Qu left many individuals of that amphibious species behind on Earth and Mars. While the ones on Earth evolved into the frogs and toads humans know today, the ones on Mars took a completely different trajectory: they slowly became smarter and achieved some form of sapience, and became the Martian Frogmen at approximately 4 million years ago.

Martian Frogmen are extremely intelligent(even compared to humans on Earth, since Martian Frogmen brains are larger than that of humans’ due to Mars’ a lower gravity), and developed technology much faster than humans. They even mastered genetic engineering even before humans.

However, you might be thinking; if the Martian Frogmen had are more advanced than humans, why is Mars’ surface so empty? The answer is that at some point of their history, an alien species attempted to conquer Mars, but failed due to resistance from the Martian Frogmen. This war made the Martian Frogmen suffer from Xenophobia, and they hid their cities underground.

Today, Martian Frogmen and humans are yet to meet each other, since the Martians are extremely good at hiding.

During the Qu’s occupation of Earth and Mars, they brought some of Earth’s life forms onto Mars. After the Qu left, they simply left behind all life forms of Earth and Mars and didn’t care about them anymore.

A species of Amphibian, which is currently mostly lost to time, was used by the Qu as pets. The Qu left many individuals of that amphibious species behind on Earth and Mars. While the ones on Earth evolved into the frogs and toads humans know today, the ones on Mars took a completely different trajectory: they slowly became smarter and achieved some form of sapience, and became the Martian Frogmen at approximately 4 million years ago.

Martian Frogmen are extremely intelligent(even compared to humans on Earth, since Martian Frogmen brains are larger than that of humans’ due to Mars’ a lower gravity), and developed technology much faster than humans. They even mastered genetic engineering even before humans.

However, you might be thinking; if the Martian Frogmen had are more advanced than humans, why is Mars’ surface so empty? The answer is that at some point of their history, an alien species attempted to conquer Mars, but failed due to resistance from the Martian Frogmen. This war made the Martian Frogmen suffer from Xenophobia, and they hid their cities underground.

Today, Martian Frogmen and humans are yet to meet each other, since the Martians are extremely good at hiding.