|We're in a bad mood because acorns haven't|
The creature is called cronopio dentiacutus. It was less than six inches long and probably ate insects. It likely survived by staying out of sight of the dinosaurs, keeping under cover and venturing out at night.
The comparison to squirrels is, actually, purely superficial. Cronopio was not even related to modern squirrels. At least that's what the scientists say. But I still think there is a certain unmistakable family resemblance.