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A male mallard. The speculum feathers are bright blue with white edges. The speculum is a patch, often distinctly coloured, on the secondary wing feathers, or remiges, of some birds. Examples of the colour(s) of the speculum in a number of ducks are: Common teal and green-winged teal: Iridescent green edged with buff. [1]
The Mariana mallard was a resident allopatric population – in most respects a good species – apparently initially derived from mallard-Pacific black duck hybrids; [139] it became extinct in the late 20th century. [140] The Laysan duck is an insular relative of the mallard, with a very small and fluctuating population.
The retention of ancestral genetic variation can be caused by incomplete lineage sorting (ILS) and introgression after secondary contact. These two factors can cause genetic variation to be shared between closely related species which is possibly why an American black duck or a Mottled duck (Anas fulvigula) may have notable white on its speculum or a Mexican duck may have flecks of green.
Mallard ducks take flight over the San Luis National Wildlife Refuge in Los Banos, Calif., on Sunday, Oct. 20, 2024. ... This includes birds such as the Black-Necked Stilt, which according to ...
A crest of feathers may appear in any duck breed or type deriving from the wild Mallard, Anas platyrhynchos, with a frequency of some 0.0001%–0.001% of all eggs hatched. [9]: 89 It results from the action of a very variable autosomal dominant allele, which is semi-lethal and may display incomplete penetrance as well as incomplete dominance.
American Pekin flock. The Pekin or White Pekin is an American breed of domestic duck, raised primarily for meat. [6] [7] It derives from birds brought to the United States from China in the nineteenth century, [8] and is now bred in many parts of the world. [6]
The family Anatidae includes the ducks and most duck-like waterfowl, such as geese and swans. These birds are adapted to an aquatic existence with webbed feet, bills which are flattened to a greater or lesser extent, and feathers that are excellent at shedding water due to special oils. Thirty-nine species have been recorded in Nevada.
The mountain bluebird is the state bird of Idaho. This list of birds of Idaho includes species documented in the U.S. state of Idaho and accepted by the Idaho Bird Records Committee (IBRC). As of January 2022, there were 433 species on the official list. One additional species is considered hypothetical. Of the 433, 180 are review species in part or all of the state.(see note) [notes 1] Eight ...
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