After last week's frenetic pace, migrations slowed and high-pressure built, bringing warm and sunny weather to Jackson Bottom Wetlands Preserve in Hillsboro, Oregon.
A CASSIN'S VIREO was reported on May 12, the first local report from spring. A pair of PURPLE MARTINS was spotted again during the week. By week's end migrant LONG-BILLED DOWITCHERS remain, but most other migrant shorebirds are gone now for their Arctic or boreal summer homes. Summer breeding shorebirds include KILLDEER, SPOTTED SANDPIPER, and WILSON'S SNIPE.
We are left with summering waterfowl now. CANADA GOOSE, MALLARD, and CINNAMON TEAL are common. A few NORTHERN SHOVELER, GADWALL, and perhaps GREEN-WINGED TEAL remain and will breed. WOOD DUCK and HOODED MERGANSERS have already fledged young; they nest earlier in nest boxes along the river.
AMERICAN ROBINS are sitting on eggs. BUSHTITS and BEWICK'S WRENS were noted carrying food to their nests. BARN SWALLOWS are building their mud nests under the footbridge.
COMMON YELLOWTHROATS and BLACK-HEADED GROSBEAKS are two conspicuous singers this week.
This week's birds...
Greater White-fronted Goose
Cackling Goose
Canada Goose
Wood Duck
Gadwall
Mallard
Cinnamon Teal
Northern Shoveler
Green-winged Teal
Lesser Scaup
Bufflehead
Ring-necked Pheasant
California Quail
Great Blue Heron
Green Heron
Turkey Vulture
Osprey
Bald Eagle
Red-tailed Hawk
Semipalmated Plover
Killdeer
Spotted Sandpiper
Western Sandpiper
Least Sandpiper
Dunlin
Short-billed Dowitcher
Long-billed Dowitcher
Wilson's Snipe
Mourning Dove
Vaux's Swift
Anna's Hummingbird
Rufous Hummingbird
Downy Woodpecker
Northern Flicker
Cassin's Vireo
Warbling Vireo
Steller's Jay
Western Scrub-Jay
American Crow
Common Raven
Tree Swallow
Violet-green Swallow
Northern Rough-winged Swallow
Cliff Swallow
Barn Swallow
Black-capped Chickadee
Bushtit
White-breasted Nuthatch
Bewick's Wren
Marsh Wren
Ruby-crowned Kinglet
American Robin
European Starling
Cedar Waxwing
Orange-crowned Warbler
Yellow Warbler
Yellow-rumped Warbler
Common Yellowthroat
Wilson's Warbler
Western Tanager
Spotted Towhee
Savannah Sparrow
Song Sparrow
Golden-crowned Sparrow
Black-headed Grosbeak
Red-winged Blackbird
Brown-headed Cowbird
House Finch
Pine Siskin
Lesser Goldfinch
American Goldfinch
Evening Grosbeak