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ABDUAmerican Black Duck (bird species)
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Pharmacokinetics of a single intramuscular injection of ceftiofur crystalline-free acid in American black ducks (Anas rubripes).
Caption: Figure 3: Average American Black Duck (a), Mallard (b), Hooded Merganser (c), and Wood Duck (d) use per ha at PC2001 and PC2013 from November to March 2013-2014 and 2014-2015.
The population trend for indicated breeding pairs of mallards (Anas platyrhnchos) and American black ducks (A.
A century of hybridization: Decreasing genetic distance between American black ducks and mallards.
Other commonly observed species include brant, mute and tundra swans, American black duck, mallard and red-breasted merganser.
Such is the dilemma facing biologists with regards to the American black duck, a close cousin of the more common and ubiquitous mallard.
Bald eagles, American black ducks, seaside sparrows, cerulean warblers, black rails, New England cottontail rabbits and shortnose sturgeons all find a home there.
In 1980, declining wintering population of American black ducks led to a coordinated effort to revive their numbers.
And along the edges of the lake in the shallower waters, hardy mallards and American black ducks loaf and feed.
Objective--To determine the pharmacokinetic properties of one intramuscular injection of ceftiofur crystalline-free acid (CCFA) in American black ducks (Arias rubripes).
And there was a significant decline in the numbers of breeding American black ducks as well, a species that at one time had been the most common breeding duck in all of Massachusetts," Mr.
The following species were recorded in our local Worcester count circle: 3,380 Canada geese, a new high; 17 mute swans; 11 wood ducks, a new high; one American wigeon; 82 American black ducks; 1,842 mallards, a new high; two green-winged teals; 12 greater scaup; 108 common golden-eyes; 82 hooded mergansers; 67 common mergansers; six ruffed grouse; 55 wild turkeys; 12 common loons, tying the record; two double-crested cormorants; two great blue herons; two adult (and one immature) bald eagles; five sharp-shinned hawks; three Cooper's hawks; one red-shouldered hawk; 42 red-tailed hawks, and one peregrine falcon.
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