Patuxent Wildlife Research Center
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| Jerry Longcore and Chris Smith Banding Black Duck; photo by Charles Kitchens, USFWS | |
| Jerry Longcore attaching transmitter on Black Duck; photo by Charles Kitchens, USFWS | |
| Transmitters and receivers; photo by Charles Kitchens, USFWS | |
| American Black Duck with brood; photo by G. Michael Haramis, USFWS | |
| American Black Duck hen in snow; photo by G. Michael Haramis, USFWS | |
| American Black Duck with brood; photo by G. Michael Haramis, USFWS | |
| Captive American Black Duck with brood in pen; photo by G. Michael Haramis, USFWS | |
| Young Black Duck with worn, brown feathers of juvenile plumage and new feathers from recent molt; photo by Jerry Longcore, USFWS | |
| Yamaska River North of Sorel, Quebec flows into Lac St. Pierrie -- high harvest area for Black Ducks; photo by Jerry Longcore, USFWS | |
| Habitat changes in southern Ontario farmland - 1985; photo by Jerry Longcore, USFWS | |
| Large brood of black ducks at Gilmore Meadows, Dixmont, Maine;photo by Jerry Longcore, USFWS | |
| Haley Beaver Flowage, looking into inlet from elevated tree stand; photo by Jerry Longcore, USFWS | |
| Ruth Nissen tracking molting Black Ducks at Missisquoi National Wildlife Refuge; photo by Jerry Longcore, USFWS | |
| Radio-marked Black Duck flying away after transmitter attached; photo by Jerry Longcore, USFWS | |
| Omnidirectional antenna on USFWS Cessna 260 plane piloted by Jim Goldsberry of USFWS; photo by Jerry Longcore, USFWS | |
| Aerial tracking observer (Jerry Longcore) with Cessna 182 plane; USFWS photo | |
| Examining Black Duck wing to detect characters of hybridization with Mallard at Orono, Maine; photo by Jerry Longcore | |
| Early Spring -- Male Black Duck waiting for hen to join him after egg-laying; photo by Jerry Longcore | |
| Flightless molting Black Duck female sneaking away -- Missisquoi National Wildlife Refuge; photo by Jerry Longcore, USFWS | |
| Wing with good evidence of pure Black Duck with white only in trailing edge of speculum in Lac Canard, Quebec, North Shore; photo by Jerry Longcore, USFWS | |
| Measuring feather growth of primaries on molting Black Duck; photo by Jerry Longcore, USFWS | |
| Black Duck female and brood, Downing Bog, Cherryfield, Maine; photo by Jerry Longcore, USFWS | |
| Daily bag of three ducks in Vermont-- note transmitter with antenna, Mac's Bend -- Missisquoi National Wildlife Refuge; photo by Jerry Longcore, USFWS | |
| Radio-marked Black Ducks and Mallards flying from holding crate after transmitter attached; photo by Jerry Longcore, USFWS | |
| Black Duck nest at Moosehorn National Wildlife Refuge, Maine in cutover area managed for Woodcock; photo by Jerry Longcore, USFWS | |
| Hatching Year Black Duck -- Radio-marked by Gerry Parker (CWS) in Nova Scotia--part of survival study; photo by Jerry Longcore, USFWS | |
| Winter banding of about 200 Black Ducks being trapped at Skillings River, Maine; photo by Jerry Longcore, USFWS | |
| Airboat nightlighting of young Black Ducks in New Brunswick; photo by Jerry Longcore, USFWS | |
| Trapping Black Ducks on St. Lawrence, Kamarouska, Quebec; photo by Jerry Longcore, USFWS | |
| Black Duck; photo by Jerry Serie, USFWS |