Squirrels - NOT amateur radio

We have lived in our present home for about 10.5 years. It is about 300m from where we used to live and where we had lots and lots of squirrels. Until this morning, despite there being lots of trees, we had never ever had a single squirrel in the garden. I cannot understand why. This morning we had our first. Apart from a few areas most are grey squirrels.

See https://en.wikipedia.org/wiki/Squirrel .