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Effect of plumage wear on the identification of female Red-winged and Tricolored Blackbirds. Western Birds. vol 35, no 4. p. 228–230. Vickers ML & Hanson RP. (1980). Experimental Infection and Serologic Survey for Selected Paramyxoviruses in Red-Winged Blackbirds Agelaius-Phoeniceus. Journal of Wildlife Diseases. vol 16, no 1. p. 125–130.
The female is brownish-grey with slight hints of the male's iridescence. The female's eye is dark brown, while the male's is bright yellow. Overall, they resemble the eastern member of the same genus, the rusty blackbird; Brewer's blackbird, however, has a shorter bill and the male's head is iridescent purple. [2]
For example, the male great-tailed grackle is 60% heavier than the female. The smallest icterid species is the orchard oriole , in which the female averages 15 cm in length (6 in) and 18 g (0.040 lb) in weight, while the largest is the Amazonian oropendola , the male of which measures 52 cm (20 in) and weighs about 550 g (1.21 lb).
A bare patch of skin that most female birds gain during the nesting season for thermoregulation purposes, by shedding feathers close to the belly, in an area that will be in contact with the eggs during incubation. The patch of bare skin is well supplied with blood vessels at the surface, facilitating heat transfer to the eggs. [56] brood parasite
Flocks of black birds have been spotted in backyards and parks over the past few weeks in the Triangle, causing many of us to do a double take when we leave our homes or pass a large, grassy field.
Bullock's oriole (Icterus bullockii) is a small New World blackbird. At one time, this species and the Baltimore oriole were considered to be a single species, the northern oriole. This bird is named after William Bullock, an English amateur naturalist.
Plumage (from Latin pluma 'feather') is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can be different colour morphs.
For instance, a single female mite can lay up to 30 eggs in her lifetime [39] and prolonged darkness can significantly accelerate their growth. [40] D. gallinae thrives at temperatures of 20–25°C and a relative humidity of 70–90%, while low humidity and extreme temperatures (below 5°C or above 45°C) hinder their development and survival.