I would add a caution to the gas explosion technique: this can trigger earthquakes due to a seismic pulse, as we can observe has happened in Christchurch. There have now been two earthquakes following the gas demolition of the house in ChCh on Friday. The first on Saturday and another this morning. Close study of the photos from ChCh reveals that No rats are present and I have it on good authority that all rats in a large radius have legged it, making one think that this method may be a viable alternative to 1080 drops, with the reservation to not use it during the bird nesting season.
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