How Chimpmunk Got His Stripes by Joseph Bruchac (2003)
Bear brags that he can do anything-even stop the sun from rising. Brown Squirrel doesn't believe him, so the two wait all night to see if the sun will rise. Sure enough, the sky reddens and the sun appears. Brown Squirrel is so happy to be right that he teases Bear. What happens when a little brown squirrel teases a big black bear? Brown Squirrel gets stripes and is called chipmunk from that day forward.