Mossoroo eggs are found in the Northern Plains; how they manage to stay moist and full of life in the midst of an unforgiving desert is a mystery to the Science and Research Center in Ark City.
Mossoroos, native to the dry Northern Plains, are a source of greenery and life in the vast desert. A nutrient-rich, wet moss grows on their backs that many desert creatures flock to for sustenance. Some small creatures ride on the backs of Mossoroos not to eat the moss but to benefit from its moisture (though others do eat it in small portions).
Mossoroos are able to sustain this moss with energy and moisture from their own bodies. This does come with some drawbacks: the drier and hotter the day is, the quicker a Mossoroo can become dehydrated. Severe dehydration can kill a Mossoroo so on the hottest days they often seek shade and water from desert oases.
Mossoroos are sometimes referred to as "The Walking Oasis."