Gray squirrels (from North America) have greatly outnumbered the native red squirrels in recent years. One theory is that because they eat acorns and red squirrels don't, they have an advantage in areas with lots of oak trees.
My cousin had left bread on the lawn, which made the magpies very happy, but this squirrel was hesitant about joining the feast. (Perhaps he heard my accent and thought I was here to deport him back to America.)
Fortunately, he was able to overcome his shyness.