Jeff Foott / Indian Rhubarb (Darmera peltata) growing on rock in river, Cascade Creek, Yosemite National Park, California

Jeff Foott / Spring run-off, Cascade Creek, Yosemite National Park, California

Konrad Wothe / Creek with suspension bridge in rainforest, Baeza, northern Ecuador

Vincent Grafhorst / Stream in Harenna Forest, Bale Mountains National Park, Ethiopia

Jeff Foott / Creek in autumn, Duck Brook, Acadia National Park, Maine

Jeff Foott / Trees in fall near Calf Creek Falls, Grand Staircase-Escalante National Monument, Utah

John Waters / Brook lamprey (Lampetra planeri) looking for food, River Kennet, Berkshire, England, UK. January.

Yva Momatiuk & John Eastcott / Climber climbing rock, Indian Creek, Utah

Chien Lee / Stream in lowland rainforest, Masoala National Park, Antsiranana, Madagascar

Matthias Breiter / Creek flowing into lake in temperate rainforest, Lake Crescent, Olympic National Park, Washington

Matthias Breiter / Waterfall and creek in temperate rainforest, Merriman Falls, Olympic National Park, Washington

Matthias Breiter / Kestner Creek, Quinault Rainforest, Olympic National Forest, Washington