Sue Daly / Plastic bag floating in the sea, resembling a jellyfish swimming Dangerous to sea turtles

Tim Fitzharris / Oak tree at Gloryhole Recreation Area, New Melones Lake, man-made reservoir managed by Central Valley Project, Calaveras County, California

Tim Fitzharris / Oak tree at Gloryhole Recreation Area, New Melones Lake, man-made reservoir managed by Central Valley Project, Calaveras County, California