Do you like scavenger hunts? How do you tell if creek water is clean and healthy? Join Lucas and his sister as they act like scientists looking for certain kinds of stream bugs (aquatic macroinvertebrates) that need clean, unpolluted water to survive. What will they find as they turn over rocks, pick up leaves and sort through the mud? Read along to find out if their creek gets a passing grade. Grade Level: 1st - 4th; Lexile 660