Planet of Birds

Redhead (Aythya americana) Science Article 5 abstract Alberta; Anatidae; Aythya americana; Circus; Circus hudsonius; egg; egg description; eggs; laying; nest; nest parasitism; Northern Harrier Fleskes,J. P, Canadian Field-Naturalist 106:263-264. Download article download full text (pdf)

Redhead (Aythya americana) Science Article 3 abstract Redheads (Aythya americana) migrate annually from their breeding range in the interior ofNorth America to winter along the coasts of the United States and Mexico. Two of the mostimportant areas where redheads traditionally concentrate in winter are the Laguna Madre andnearby bays in southern Texas and the Chandeleur […]

Redhead (Aythya americana) Science Article 1 abstract We detected no infections with species of Plasmodium, Haemoproteus, Leucocytozoon,Sarcocystis or Trypanosoma in blood smears, liver and spleen impressions, and muscle tissue from 136 redheads (Aythya americana) collected or captured at the ChandeleurIslands, Louisiana (USA), during three winters (1987 to 1990). Thomas C. Michot, Journal of Wildlife Diseases, […]

Redhead (Aythya americana) Science Article 4 abstract Numerous investigators have shown experimentally that nasal or supraorbital salt glands exist in nonmarine waterfowl and have the ability to enlarge or atrophyi n responset o changesin the salt content of the drinking water (Scothome 1959, Ellis et al. 1963, Cooch 1964, Benson and Phillips 1964, Schmidt-Nielsen and […]

Redhead (Aythya americana) Science Article 2 abstract Diets of wintering redheads (Aythya americana) have been studied in the past, but none of theprevious studies compared diets of the upper gastrointestinal tract to determine if they differeddue to sex, age, location, year, or time of year. MICHOT, T. C et al, Acta Zoologica Academiae Scientiarum Hungaricae […]