That's not a plot exactly, and the lack of explanation is integral to their purpose. They're accepted as omens by the native races despite the lack of explanation. In that capacity they make as much sense as any other supernatural element we've seen to exist on Oddworld. If it helps, think of them as simulacra: things that just happen to resemble the species' prints enough that willing believers will see them.
Next you'll be telling me you don't believe Jesus manifests his image on waffles.
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