Beavers cannot swim if you put 40grs of lead in their right ear. It totally upsets their center of gravity. With their center of gravity so upset their normal righting arm gets skewed to the bow which throws off their center of balance resulting in the center of gravity moving forward to the point that they submerge and never return to the surface. At least I think that is how it works, Has the same effect on rats and mice too. Really does a number on frogs ears.
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