The Hudson River School was an American art movement from the mid-19th century comprised of landscape painters like Thomas Cole, Frederic Edwin Church, Albert Bierstadt, and Martin Johnson Heade. While not a formal institution, these romantic painters were influenced by each other and painted detailed landscapes of the Hudson River Valley and other natural areas, celebrating an idealized American wilderness. Martin Johnson Heade in particular became known for his portraits of hummingbirds in addition to landscapes of the Maine coast, Florida marshes, and American West.