As the seasons change, a river in Alaska reveals its remarkable biodiversity. A great web of life is presented—the river and its shores sustain an astonishing variety of plants and animals. The river is home: salmon fry and rainbow trout live in it, plankton drifts in its current. The river is food: bears and bald eagles catch salmon, big fish chase little fish, tree roots absorb the river water. This evocative nonfiction picture book follows a year in the life of this Alaskan river. The lyrical text and lush paintings introduce young readers to the sights and sounds of the river and its inhabitants and are rich in details certain to fascinate ecologists of all ages.