Martians

Green Men, an extinct race of humanoids who lived on Mars about a million years ago. The only proof of their existence is their fossilized remains found all over the planet.

Anatomy
The Martian has a tall skinny bodies, with four fingers including thumbs on both hands, bulbous head, and three toes on each foot. Also the Martian have two round eyes similar to human eyes, long nose, and a mouth with small teeth.

History
Little is known about their history but some mummified Martian bodies have been found to date back to 9000 B.C. probably their civilization was destroyed by that time. What really happened to them remains a mystery to this day. Some theories state that a more advanced race of extraterrestrials wiped them out.

Language
The Martian language must have been advanced and complicated to learn. Maybe they communicated by building monuments and structures. Also they could have spoken different dialects in certain regions of Mars.

Culture
The Martians must of had a culture based on their architecture and wealth. They were an industrial race, making machines and spacecrafts to explore the universe.

Technology
The Martians must of had great technology.

Decline
The Martians built great cities however this came with environmental consequences that lead to their demise. Basically they caused their extinction by suffocating themselves with their industrial gases.