Molehill
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A molehill is a mound of soil raised by a burrowing mole. They are quite often the only sign to indicate the presence of a mole and can be advantageous to the environment.
Molehills have an important benefit to soil by aerating and tilling it, adding to its fertility. They may however cause damage to gardens and areas of grass (such as a golf course), and in 1702, William III of England died when his horse tripped on a molehill. Such accidents, however, are quite rare.
The English idiom "making a mountain out of a molehill" means to exaggerate a situation.