|This is a quick and enjoyable read. I like that there are two surprises at the end -- the deserted nest full of seeds, and the fact that the speakers are themselves squirrels. I definitely didn't guess that detail until the end, but once I got it, I went back through to read it again. The two discussing the traffic of previous mice makes more sense in retrospect.
I only have a few small suggestions for correction. For clarity, the sentence, "They started exploring." could be moved to the beginning of next paragraph describing the attic. Also, the use of ellipses three times during Ted's dialogue was mildly distracting. Other than that, the writing is clear and conversational. Nice work overall.