I have always loved squirrels. When I worked at the South African parliament, I used to walk to the gardens nearby and feed them. They were pretty tame and would take the nuts out of your hand.
In Sweden in my last apartment we had red squirrels in our trees and a few times we ended up with them in our living room, being chased by the cats. Squirrels, like cheetah, become tame very quickly and you have to watch out for that.
I have always adored the squirrel photograph of Geert Weggen. This must take so much patience!