Thursday, May 13, 2010
Jackson Bottom birds: May 7-13, 2010
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
Great Blue Heron
Northern Rough-winged Swallow