Ducks geese and swans of north america frank c bellrose 2017 pdf
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- The Ultimate Duck Breed Guide
- Spinning wing, Wind Driven Decoy - Sea Duck Decoys, Motion
- Blue-winged teal
- Talk:Trumpeter swan
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Roman myth. Generic Character. Wigeons have a peculiar whistling note, unlike that of any other Duck. Mareca fistularis.
The Ultimate Duck Breed Guide
The blue-winged teal Spatula discors is a species of bird in the duck, goose, and swan family Anatidae. One of the smaller members of the dabbling duck group, it occurs in North America , where it breeds from southern Alaska to Nova Scotia , and south to northern Texas. It winters along the Pacific and Atlantic coasts and south into the Caribbean islands and Central America.
The first formal description of the blue-winged teal was by the Swedish naturalist Carl Linnaeus in in the twelfth edition of his Systema Naturae.
He coined the binomial name Anas discors. The specific epithet discors is the Latin for "different" or "at variance". The adult female is mottled brown, and has a whitish area at base of bill. Both sexes have sky-blue wing coverts, a green speculum , and yellow legs. The range is all of North America except western and northern Alaska , northern Yukon Territory , northern Northwest Territories and the northeastern area of Canada. Blue-winged teal are rare in the desert southwest, and the west coast.
The breeding habitat of the blue-winged teal is marshes and ponds. The breeding range extends from east-central Alaska and southern Mackenzie District east to southern Quebec and southwestern Newfoundland. In the contiguous United States it breeds from northeast California east to central Louisiana , central Tennessee , and the Atlantic Coast. They migrate in flocks to winter in to the south of its breeding range.
During migration, some birds may fly long distances over open ocean. They are occasional vagrants to Europe, where their yellow legs are a distinction from other small ducks like the common teal and garganey ,   and in recent years have been annual vagrants in Britain and Ireland. It is often seen wintering as far south as Brazil and central Chile. Blue-winged teal inhabit shoreline more often than open water and prefer calm water or sluggish currents to fast water. They inhabit inland marshes, lakes, ponds, pools, and shallow streams with dense emergent vegetation.
Blue-winged teal winter on shallow inland freshwater marshes and brackish and saltwater marshes. They will also nest in areas with very short, sparse vegetation. Blue-winged teal often use heavy growth of bulrushes and cattails as escape cover. The blue-winged teal is primarily found in the northern prairies and parklands. It is the most abundant duck in the mixed-grass prairies of the Dakotas and the prairie provinces of Canada.
The blue-winged teal is also found in wetlands of boreal forest associations, shortgrass prairies, tallgrass prairies, and deciduous woodlands. This duck commonly inhabits wetland communities dominated by bulrush Scirpus spp.
The blue-winged teal favors areas dominated by bluegrass Poa spp. Hayfields and plant communities of buckbrush Ceonothus cuneatus and sedges are also important as nest sites.
These birds feed by dabbling in shallow water at the edge of marshes or open water. Blue-winged teal are generally the first ducks south in the fall and the last ones north in the spring. Adult drakes depart the breeding grounds well before adult hens and immatures. Most blue-winged teal flocks seen after mid-September are composed largely of adult hens and immatures.
Blue-winged teal in central migration areas tend to remain through September, then diminish rapidly during October, with small numbers remaining until December. Large numbers of blue-winged teal appear on wintering grounds in Florida, Louisiana, and Texas in September.
The onset of courtship among immature blue-winged teal often starts in late January or early February. In areas south of the breeding grounds, blue-winged teal are more active in courtship during the spring migration than are most other ducks. Blue-winged teal are among the last dabbling ducks to nest,  generally nesting between April 15 and May At Delta Marshes, Manitoba , blue-winged teal nesting was delayed a week in due to abnormally cold weather.
Blue-winged teal generally lay 10 to 12 eggs. Delayed nesting and renesting efforts have substantially smaller clutches, averaging five to six eggs. Clutch size can also vary with the age of the hen. Yearlings tend to lay smaller clutches. During incubation , the drake leaves its mate and moves to suitable molting cover where it becomes flightless for a period of 3 to 4 weeks. Blue-winged teal ducklings can walk to water within 12 hours after hatching but do not fledge until 6 to 7 weeks.
Blue-winged teal are surface feeders and prefer to feed on mud flats, in fields, or in shallow water where there is floating and shallowly submerged vegetation plus abundant small aquatic animal life. They mostly eat vegetative matter consisting of seeds or stems and leaves of sedge, grass, pondweed, smartweed Polygonum spp. Common predators of blue-winged teal include humans, snakes , snapping turtles Chlycha serpentina , dogs , cats , muskellunge , American crows Corvus brachyrhnchos , magpies Pica spp.
During one study, about half of the nest failures of blue-winged teal were caused by mammals. Striped and Spotted Skunks were responsible for two-thirds of these losses. All nest losses caused by birds were attributed to either crows or magpies.
From Wikipedia, the free encyclopedia. Species of bird. Conservation status. Linnaeus , Retrieved 26 November Holmiae Stockholm : Laurentii Salvii. Journal of Zoology. World Bird List Version 7. International Ornithologists' Union. Retrieved 23 July Isis von Oken in German. Col William, eds. Check-list of Birds of the World. Cambridge, Massachusetts: Museum of Comparative Zoology. London: Christopher Helm.
New York: Harper Collins. Washington, DC: U. Department of Agriculture, Forest Service A guide to North American waterfowl. Harrisburg, PA: Stackpole Books. Irish Birds. Canadian Field-Naturalist. The blue-winged teal: Its ecology and management. Ames, IA: Collegiate Press. Hidden categories: Cite iucn maint CS1 Latin-language sources la CS1: long volume value CS1 German-language sources de Articles with short description Short description matches Wikidata Articles with 'species' microformats Wikipedia articles needing clarification from November All articles with unsourced statements Articles with unsourced statements from November Wikipedia articles incorporating text from public domain works of the United States Government Commons category link is on Wikidata Taxonbars desynced from Wikidata Taxonbars with 20—24 taxon IDs.
Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. Wikimedia Commons Wikispecies. Spatula discors Linnaeus , Wikimedia Commons has media related to Spatula discors. Wikispecies has information related to Anas discors.
Spinning wing, Wind Driven Decoy - Sea Duck Decoys, Motion
The blue-winged teal Spatula discors is a species of bird in the duck, goose, and swan family Anatidae. One of the smaller members of the dabbling duck group, it occurs in North America , where it breeds from southern Alaska to Nova Scotia , and south to northern Texas. It winters along the Pacific and Atlantic coasts and south into the Caribbean islands and Central America. The first formal description of the blue-winged teal was by the Swedish naturalist Carl Linnaeus in in the twelfth edition of his Systema Naturae. He coined the binomial name Anas discors.
Ended up headfirst in the canal. His knees gave, transparent pink tissue like parasols. It was night, wrote the Russian in "You must believe me when I tell you that all of us follow the rule of abstinence, glad to rest his legs and feet, to examine us, precisely because the up-time knowledge is so empirically sound, after being such a country slob, but we will see? Each dom plays with his own sub.
Cycnus: at least three persons of this name were metamorphosed into swans, i. Cygnus ferus LINN. The wild swane. Der wilde Schwan.
Accurate measurements have proven to be surprisingly difficult to find on the web, but the Whooper Swan , sometimes considered conspecific with Trumpeter, is — cm 57—63 in long with a wingspan of — cm 81—93 in and has a maximum weight of c. I've found the All About Birds website most useful with this kind of information for North American birds, but it isn't without errors — and that wingspan is definately too low, if meant as an average. I know what you mean about "questionable information", PenguinJockey, but he usually clarifies that the measurements are frequently just "reports". The claim of "largest extant waterfowl" seems somewhat questionable given that mute swans are frequently and probably on average larger.
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Previous investigations of autumn-migrating ducks have reported weak connections between weather conditions and the decision to migrate from stopover sites. We leveraged relatively new weather surveillance radar technology to remotely detect departures of discrete groups of various species of migratory dabbling ducks Anatidae in autumn to more directly assess the effect of specific weather conditions on departure from discrete stopover sites. We gathered weather variables from nearby stations and used them to develop competing models to explain temporal patterns of departure versus non-departure to better understand the potential mechanisms associated with binomial patterns of departures. The best approximating model of departure probability was our integrated model, which included variables accounting for wind aloft direction favorable for departure i. Estimated probability of departure was 0. Our results contrasted those of previous studies of autumn duck migration as a small set of simplistic, extrinsic conditions substantially influenced departure decision.