Exterminate.

"Information on how to deal with one of Scotland's most notorious alien species, the signal crayfish, will be published today. The species is an increasingly common sight, particularly in Loch Ken where it has become the dominant species. A new leaflet on the signal crayfish and the threat it poses will be launched by Environment Minister Michael Russell at the Galloway Game Fair. Mr Russell said: "Alongside the grey squirrel, Japanese knotweed and the American mink, the signal crayfish is one of the most problematic invasive species introduced to these shores. As well as competing with valuable native fish such as trout and salmon, the holes they bore into river banks for their nests can leave the land weak and lead to a greater risk of flooding. The leaflet I am launching seeks to raise awareness of the signal crayfish, which is a particular problem in the Galloway area. Any angler who catches one is urged to kill it on sight, not to throw it back into the water or take it away alive and contact the Scottish Government, Fisheries Research Services, Scottish Natural Heritage or SEPA."

Normally our politicians are in favour of a bit of wildlife, but clearly not Mike "The Exterminator" Russell. Watch out you grey squirrels.