Not pigs. You can eat pigs (the afore-mentioned neighbour has had one of the 3 blasted nuisances slaughtered, there are still 2 to go; I've asked him if he can get any of the blood back...). The swine! Perhaps... ;-)

The only time I've had a chimbley fire was right at the top. I lit the front-room one, not realising that rooks had built a nest (it wasn't capped, it is now). Sparks eventually did their work!