annodomini, I suspect squirrels, like rats, could take over the world if we aren't vigilant. The doodle dogs have just had a mad moment, when a squirrel trotted over to the bird hangers - one dog now chilling out, younger dog sitting by the window, 150% vigilant in case it returns.
Agus - I had to have the rat man out some years ago, after seeing one in the garden. Evidently, the drains had overflowed during storms and the rats were seeking alternative accommodation. He inspected my chicken/rat prevention efforts, and said all was good. The only thing he queried was the ivy tumbling around the dreaded leylandi in a neighbour's garden that adjoins ours. He said the ivy would make perfect rat runs. I am not good with rodents 