I’ve only ever seen red squirrels in evergreens - one hemlock avenue in Massachusetts, an island in Vermont, and in Alaska.
The Alaskan ones hang mushrooms up in the tree to dry, and then put them in their food storage midden!
That's interesting about evergreens. What I call red squirrels are beautiful gold with lighter gold bellies and big bushy tails. I have photos of the one who would take nuts from my fingers, but I can't post photos these days because Flickr doesn't like my old Safari browser.
As to evergreen, we have them here, but most of the trees are deciduous. Lots of oaks and sugar maples. Also those gorgeous red maples.
Midden is a new word for me. I'll try to remember that. And I just saw an article about two white turkeys that were pardoned, walking in the snow. One was named Zoey. Since I pronounce it with a long o, I shouldn't put two o's in her name. I swear, if you name your favorite ones, they get to know it.
I've had squirrels get in my house. That is a trip. Even the friendly ones. They panic. One the cat was chasing all over. I got it cornered in the bathroom where I could close the door. I went in (I'm not afraid of them), the squirrel was sitting atop a mop behind the door. I went about opening the window, opening the screen and storm, barely had time to stand back, and that squirrel ran over the sink and toilet, and leaped out the window landing on the neighbor's fence lol.