My son found a mouse nest wedged in the canoe he was cleaning, with three babies and a mother mouse running back and forth. He set the nest aside and the mother hauled off two of the babies into the woods, leaving this on unattended. Hopefully she'll come back.
What kinds of mouse? I couldn't begin to say. In this area we have the White-Footed Mouse (which can go up in the trees and use bird nests), the Meadow Jumping Mouse, and the Woodland Jumping Mouse (which can jump 6 to 8 feet). Then there are the voles and several species of shrews, which the average person would also call a mouse.