On Dec 20, 9:17 am, David in Normandy wrote:
We've got lots of normal mole hills in the "lawn", but the
other day a solitary mole hill appeared away from all the
other hills, that was double the size of all the others. I
raked all the earth away and onto a flower bed exposing a
hole about 2 inches diameter going into the ground at a
steep angle. I poured a container full of old cooking oil
down the hole. Today there is another large hill above the
same hole.

Is this a mole or some other burrowing rodent? I've not
seen moles attempt to make "a mountain out of mole hill"
before. Perhaps this is an ordinary mole aiming for some
sort of construction record for the largest hill?
--
David in Normandy

Could it be a young one David, they tend to burrow on the top.