Question

something there is that doesnt love a wall, that sends the frozen - ground - swell under it, and spills the upper boulders in the sun; and makes gaps even two can pass abreast. the work of hunters is another thing: i have come after them and made repair where they have left not one stone on a stone, but they would have the rabbit out of hiding, to please the yelping dogs. the gaps i mean, no one has seen them made or heard them made, but at spring mending - time we find them there. whom does the speaker blame for the gaps in the wall? his neighbor

Explanation:

The speaker blames natural forces like the frozen - ground - swell and the work of hunters for the gaps in the wall, not the neighbor. Hunters break the wall to flush out rabbits for their dogs, and natural processes cause boulders to spill and gaps to form.

Answer:

Natural forces and hunters