[mobertol]

We had a nest in the back wall of our house last year. The guys on the farm pumped diesel in to try and kill them but it didn't work though thousands died. The walls were literally humming - some bright spark (who shall remain nameless but is my other half) decided to close their entrance in the bricks and they started coming in the house in the evening crawling towards the light along the pipes in the heating stystem and coming through cracks round the radiators (it's an old house and Italian plumbing is not noted for being good).
For three days, till we worked out where they were getting in and siliconed up the cracks, it was a bit like living in a Hitchcock movie -shades of "The Birds". In the end we called out the experts who dealt with them.
This morning we had a strange phenomenon with Ants -it is the first warm day after 3 days rain and the path outside all the houses here was literally dark brown with swarming ants. After a while the live ones disappeared and there were just loads of dead ones left -looks like something had happened and they were bringing out their dead!