The Twin Barns and winter wetlands at Nisqually National Wildlife Refuge in Washington. Photo taken from the maintenance road on the west side of the refuge.

American Bittern at Nisqually National Wildlife Refuge in Washington. Photo taken from the Dike Trail by the marsh area near the new boardwalk.

Male Wood Duck at Nisqually National Wildlife Refuge in Washington. Photo taken from the pond overlook by the visitor center.

Killdeer at Nisqually National Wildlife Refuge in Washington. Photo taken from the Nisqually Estuary Trail.

Song Sparrow at Nisqually National Wildlife Refuge in Washington. Photo taken from the pond overlook by the visitor center.

Golden-crowned Kinglet at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

A view of the habitat restoration at Nisqually National Wildlife Refuge in Washington. The Olympic Mountains are seen in the background. Photo taken from the Dike Trail.

Great Egret standing next to a frozen pond at Nisqually National Wildlife Refuge in Washington. Photo taken from the Nisqually Estuary Trail.

Wood Duck pair at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Male Downy Woodpecker at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Male American Goldfinch at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Black-capped Chickadee with a caterpillar snack at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Heron comparison. Great Blue Heron and Green Heron at Nisqually National Wildlife Refuge in Washington. Photo taken from the Wetlands Overlook along the Twin Barns Loop Trail.

Canada Goose resting on a log at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Male Mallard at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Young barn swallows taking turns receiving gourmet insects for lunch at Nisqually National Wildlife Refuge in Washington. Photo taken from the pond overlook by the visitor center.

Willow Flycatcher with fluff from a cottonwood tree on its beak at Nisqually National Wildlife Refuge near Olympia, Washington. Photo taken along the Twin Barns Loop Trail.

Female Rufous Hummingbird in nest at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Great Blue Heron at Nisqually National Wildlife Refuge in Washington. Photo taken from the Twin Barns Loop Trail.

Cackling Goose at Nisqually National Wildlife Refuge in Washington. Photo taken from the maintenance road on the west side of the refuge.

Great Horned Owl and owlet at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail in 2010.

Juvenile Swainson's Thrush at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Willow Flycatcher with fluff from a cottonwood tree on its beak at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

Common Muskrat at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.

American Bittern at Nisqually National Wildlife Refuge in Washington. Photo taken from the Dike Trail by the marsh area near the new boardwalk.

Cackling Geese at Nisqually National Wildlife Refuge in Washington. Photo taken from the maintenance road on the west side of the refuge.

Greater Yellowlegs in non-breeding plumage at Nisqually National Wildlife Refuge in Washington. Photo taken from the Nisqually Estuary Trail.

Golden-crowned Sparrow in non-breeding plumage. Photo taken at Nisqually National Wildlife Refuge near Olympia, Washington.

Bewick's Wren at Nisqually National Wildlife Refuge in Washington. Photo taken along the Twin Barns Loop Trail.