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Its just a simple house mouse. The grey/white colour is not normal but just a natural variation.

Variation, be it in colouring or physical mutation is perfectly natural though uncommon in adults as ones that look different don't usually reach maturity because they stand out to predators.

However, excessive variation in appearance become quite common in populations with a surplus of food. Its more common in house mice than other mouse species, as they are in closest proximity to humans, with potential food sources and warm, safe hidey-holes.

 

Basically, it means that life is so easy for the critters (due to excess food and absence of predators) that their appearance has become less important to their survival, so they cease to be uniform. Ain't nature clever? :thumbs:

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