What specific coloration pattern is described for the water vole's fur regarding its upper body versus its underside?
Answer
Dark brown or reddish-brown above, lightening to greyish or off-white below
The water vole's coat exhibits a common pattern known as countershading, which is vital for camouflage within its riverine habitat. The fur along the back and the upper flanks typically presents a dark brown or rich reddish-brown hue. As the coloration moves towards the underside of the animal, it lightens significantly, often appearing as a paler greyish or off-white shade. This dual coloring provides camouflage benefits in two ways: the dark top blends with the muddy banks or dark water surface when viewed from above, and the lighter underside helps it blend with the lighter sky if viewed from beneath the water surface.
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