Stopping the ducks

Finished product

we were visited by our neighbour. Did  we know that our ducks were out on the main road ( actually, finding various animals on the road isnt that unusual) ?  No we didnt , so we rounded them up  and herded them back. 
the geese are getting more adventurous and  are spending time on the lawn and in the pond usually  occupied by  the ducks and we think the ducks are setting off and exploring . The only place we could find that they might be getting out is a bit of wall that had fallen down .

So I would have to sort it out.
First step is dismantling the old wall, preserving and sorting the stones (coping stones, throughstones, hearting etc) . And in this wall I found a length of cast-iron pipe.

And the wall was running over a culvert, that had some cabling coming out  of it . Not sure what this is - phone line perhaps. the culvert could be for the rainwater coming off the moorland , 

  And the other thing is that i suspect the wall came down whilst the tree was young, flattened it a bit , it recovered and continued to grow, so it has a semicircular root.

So I dispensed   with the drainpipe, found some stones large enough to span the gap and rebuilt the wall.

Wall 1/2-finished and circular tree-root