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Results 1 - 10 from 15 for plumage differences in 0.368 sec.
Hummingbird F.A.Q.s from the Southeastern Arizona Bird Observatory
Hummingbirds of North America (a Peterson Field Guide), will help you sort out the plumage differences in your common species as well as prepare you in case a wanderer of a ...
sabo.org
Purple Martin Identification
These classes are: adult male, adult female, subadult male, and subadult female. (After ... a fifth distinguishable sex/age class - the juveniles. Juveniles can not be sexed by plumage differences.) Another system for describing the three age classes of martins is: HY = "hatching year ...
purplemartin.org
Color Guide
These classes are: adult male, adult female, subadult male, and subadult female. (After ... a fifth distinguishable sex/age class - the juveniles. Juveniles can not be sexed by plumage differences.) Another system for describing the three age classes of martins is: HY = "hatching year ...
purplemartin.org
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USGS Patuxent Wildlife Research Center Staff Profile
WNV antibodies based on egg lay order, offspring gender, and plumage pattern. In songbirds, we use comparative studies to illuminate the principles of evolution of ... parameters of cowbirds vs related non-parasitic species. We predicted differences in disease resistance among the blackbird species based on differences in life history, because they differ in geographic range ...
www.pwrc.usgs.gov
Fiesta de las Aves 2008 - Schedule of Events
Up to 12 species of hummingbirds may be present, offering opportunities to study fine differences in plumage, behavior, and voice under the guidance of an expert. Limited to 8 participants. Garden ...
sabo.org
Coastal and Pelagic Birds of Long Island
These differences often result in local concentration of food resources ... Unlike the overwhelming majority of waterfowl species, the oldsquaw has distinctive breeding and nonbreeding plumage. Common at Montauk Point, in eastern Gardiner's Bay and Long Island Sound. ...
cresli.org
Trumpeter Swan Factsheet - WDNR
Preening is vital to maintaining the bird's plumage. When preening, a Trumpeter presses its bill against the base of the tail to extract ... protected from hunting in the Mississippi Flyway. Aggressive educational campaigns are necessary to emphasize the differences between swans and Snow Geese. In general, it is wanton shooting, not hunting, that presents ...
www.dnr.state.wi.us
Barn Owl - WDNR
This enables the bird to sense direction and distance by differences in the intensity of the sound that reaches each ear. Barn owls use their ears ... . A map outlining Pre-1977 and 1997 to Present Distribution is available. Aid to ID: Plumage is whitish or pale cinnamon below, sometimes speckled with black, and rusty buff or orange ...
www.dnr.state.wi.us
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Nature, hummingbird, buff-bellied, Amazilia, yucatanensis
Although many hummingbird species--including the Ruby-throated Hummingbirds common to the Carolinas--show sexual dimorphism in their adult plumage, sexes are alike in the Buff-bellied Hummingbird. Some experts report sexual differences with regard to tail and wing measurements, ...
hiltonpond.org
Perdita: The "Lost" Rufous Hummingbird, Selasphorus rufus
And, as expected, the tiny etchings (corrugations) that incise a young hummer's maxilla ( ... intense, and--we suspect--experienced birds are probably better at preening themselves and keeping their plumage in good condition. This year, Perdita's rectrices--her tail feathers (top view above)-- ...
hiltonpond.org
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