Jack Dykinga / Western sword fern (Polystichum munitum) and Big leaf maple (Acer macrophyllum) trees that are covered with moss, Hoh Temperate Rainforest, Olympic National Park, Washington, USA. June 2017.

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

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

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

John Abbott / Low angle view of trees in the Hoh Rainforest, Hall of Mosses Trail, Olympic National Park, Jefferson County, Washington, USA, June.

Floris van Breugel / Late fall colors linger among the mossy trees (Acer macrophyllum) in the Hoh Rainforest in Olympic National Park. Washington, USA. November 2012

Gerrit Vyn / Clearing / timber removal in the Olympic National Forest, Washington, USA, March 2010

Tim Laman / Boy (5 years) working on activity sheet in Olympic National Park, Washington, USA, August 2005, Model released

Gerry Ellis / Nurse log stage five temperate rainforest, Olympic National Park, Washington

Gerry Ellis / Temperate rainforest clear cutting with logging road, Olympic National Forest, Washington