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Why do the pocket mice in the dark lava environment have white underbellies?
the top of their bodies, providing camouflage so predators won't see them. The mice's underbellies are white because there's so selective pressure for it to be dark; the predators come from above.
Are dark and light rock pocket mice the same species?
Variation • There are black rock pocket mice and tan rock pocket mice, and they belong to the same species.