Molehill

[2] The phrase "making a mountain out of a molehill" is commonly used metaphorically to mean "to exaggerate a minor problem".

[4] The disturbance of the soil brings an important benefit by aerating and tilling it, adding to its fertility.

[6] However, they may cause damage to gardens and functional areas of grass such as pasture land, and they represent a minor safety hazard.

King William III of England is recorded as dying from complications after he was thrown when his horse stumbled on one.

This leaves the animals and their galleries undamaged and thus reduces the need for the moles to make further molehills when they clear earth out of the tunnels.