We have two kinds of tree squirrels where I live now, red squirrels and pineys. Red squirrels, like the one in the photo you posted at the top, is a little larger than the gray squirrels down south. Chunkier and “beefier”, not scrawny.
Pineys are smaller, about the size of a chipmunk. They move very fast.
The red squirrels don’t bother us. The pineys are a nuisance. We have to keep an eye on them.
We have two kinds of gray squirrels here, with tails and without tails.
Those without tails are ‘slow squirrels’...........Lots of feral cats, too.