Space Mouse

Space Mice are a space-faring species of Rodent commonly found on the moon, and make an appearance in the 2002 video game Rugrats: Royal Ransom.

Appearance
Although these creatures are referred to as "mice", they are shown to be much larger than their namesake, more akin to the much larger Rat species than to a mouse. They are pinkish in color, presumably hairless due to living on the moon.

Behavior
Space Mice are essentially harmless, and will quickly run away from lifeforms larger than themselves.

Sapience
It is still under question of how much sapience the Space Mice have. They have been observed to wear and use a form of low-propelled jetpack, which can activate in order to help the Space Mice better evade larger creatures. Even with this in mind, they aren't shown to have any behaviors outside of typical Earth rodents.