Five pages already, all about squirrels! Astounding!
No fan of Greys here: they actually first appeared on the scene in Britain around 1870, as free-roaming pets. Not surprisingly, they became naturalised. Many introductions of other non-native species have gone unremarked, but this particular one aroused alarm very quickly, once it was realised that it was displacing the native species. I have never seen a Red Squirrel in south-east England: I'm certain they don't occur hereabouts any more.
I'm in two minds as to whether Greys should be controlled - let alone exterminated. In most situations they aren't a serious pest. Just a sad example of 'Darwinism' at work.
The 'pine marten' solution looks encouraging. They are predators on both species of squirrel, but the Red, being smaller and lighter, is able to venture out onto the thinner ends of branches where the marten can't catch it. The Grey Squirrel, being heavier, can't - so it ends up as supper. A good 'natural' solution - if it works.
To see Red Squirrels in any quantity, I have to cross over to France. Plenty there - although less common than the Grey is in England. Delightfully agile little creatures!
Suppose that this room is a lift. The support breaks and down we go with ever-increasing velocity.
Let us pass the time by performing physical experiments...
--- Arthur Eddington (creator of the Eddington Number).