Question of the Day

Why do our ducks (some brown domestic breed) dig holes in the ground beside the water tub using their bills?  The holes are about the diameter of a pop can and can be up to six inches deep.  They fill with water and the ducks swish and rattle their bills within.  Is this the equivalent of duck tooth-brushing?

I have spent a full 15 seconds Googling the subject and found nothing.


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