The Redhead Duck Aythya americana is a medium-sized diving duck , 37 cm long with an 84 cm wingspan. The adult male has a blue bill, a red head and neck, a black breast, yellow eyes and a grey back. The adult female has a brown head and body and a darker bluish bill with a black tip. The breeding habitat is marshes and prairie potholes in western North America. Loss of nesting habitat has led to sharply declining populations.
3 Reasons Sex With Red Heads Is Simply the Best
Reasons Sex With Red Heads Is Simply the Best, According to Science – SheKnows
Scientists have discovered eight genes linked to red hair, helping to solve a mystery of how redheads inherit their flaming locks. The study -- which also sheds light on blondes and brunettes -- is the largest genetic study of hair colour to date. It had been thought that red hair is controlled by a single gene, called MC1R. The new research sheds light on other genes that are involved. Previous studies had shown that redheads inherit two versions of the MC1R gene that leads to red hair -- one from their mum and one from their dad. Although almost everyone with red hair has two copies of the red-haired version of MC1R, not everyone carrying two red-haired versions is a redhead.
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How to Tell a Canvasback from a Redhead
The redhead Aythya americana is a medium-sized diving duck. The scientific name is derived from Greek aithuia an unidentified seabird mentioned by authors including Hesychius and Aristotle , and Latin americana , of America. Redhead weight ranges from 2. The redhead and the common pochard form a sister group which together is sister to the canvasback. The redhead goes by many names, including the red-headed duck and the red-headed pochard.
Red hair or ginger hair occurs naturally in one to two percent of the human population , appearing with greater frequency two to six percent among people of Northern or Northwestern European ancestry and lesser frequency in other populations. It is most common in individuals homozygous for a recessive allele on chromosome 16 that produces an altered version of the MC1R protein. Red hair varies in hue from a deep burgundy or bright copper , or auburn , to burnt orange or red-orange to strawberry blond. Characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin , it is associated with fair skin color , lighter eye color , freckles , and sensitivity to ultraviolet light. Cultural reactions to red hair have varied from ridicule to admiration with many common stereotypes in existence regarding redheads.