Mars is an unlockable stage in Zebra Evolution, where new types of zebra become available, pooping rubies instead of coins.
Rather than purchasing zebras or a crate delivery service, you must exchange rubies with the alien for alien zebra eggs.
There are 12 different zebras available here, across two parts of Mars:
The Belzebroo can be traded with the alien for 30 diamonds, but this will lower your rubies per minute stat.
