I don't know how many of you have ever seen or even heard of a pine squirrel. They are tiny, like baby eastern brown squirrels, maybe an 7-8 inch body less tail. Well they chase off the grey squirrels that are easily twice as big as them and they rule my garden. They can get into any squirrel proof bird feeder that i've seen. I have one that uses the squirrels weight to close covers over the food hoppers. I even removed one of the two springs to make it more sensitive. Well he might leap from another tree and grab it gpoing by. They she hangs upside down holding on with three paws like a human climber while pushing up with the third paw to raise itself and the cage high enough to get to the food.
There are some Pikas here too, but they are rarely ever seen.
These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.