My first and second grade students read a Scholastic Who Would Win book (grizzly bear v. polar bear, lion v. tiger, or killer whale v. shark) with a partner. They used the categories listed at the end of the book to compare the 2 animals. Using Educreations (or any other app of their choice, although all 12 groups chose Educreations) they explained which animal would "win" in each category. Then they put all the information together and predicted in a fight which animal would win. Next year I need to be more specific with my directions. I had wanted more explanation than I got. For example, "polar bears would win in size over grizzly bears because they are about 400 pounds heavier" rather than just "polar bears are bigger than grizzly bears".