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The female blue-footed booby lays two or three eggs, about four to five days apart. Both male and female take turns incubating the eggs, while the nonsitting bird keeps watch. Since the blue-footed booby does not have a brooding patch, it uses its feet to keep the eggs warm. The incubation period is 41–45 days. Usually, one or two chicks are ...
Sexual selection in birds concerns how birds have evolved a variety of mating behaviors, with the peacock tail being perhaps the most famous example of sexual selection and the Fisherian runaway. Commonly occurring sexual dimorphisms such as size and color differences are energetically costly attributes that signal competitive breeding ...
Harrison Tordoff, a World War II fighter ace and later a noted ornithologist, named his P-51 Mustang Upupa epops, the scientific name of the hoopoe bird. [ 47 ] A talking hoopoe named Almost Brilliant is a character in Nghi Vo's Singing Hills Cycle , first appearing in The Empress of Salt and Fortune .
Female preference for long tails was first observed in long-tailed widowbirds, and subsequently in Jackson's widowbird and the red-collared widowbird. [12] Tail length explains 47% of the male's reproductive success, indicating the strength of this sexual ornament. [13] Tail symmetry, however, does not have an effect on mating success.
The long-tailed widowbird (Euplectes progne) is a species of bird in the family Ploceidae. [2] The species are found in Angola, Botswana, the Democratic Republic of the Congo, Kenya, Lesotho, South Africa, Eswatini, and Zambia. [3] The long-tailed widowbird is a medium-sized bird and one of the most common in the territories it inhabits. [4]
European pied flycatchers, 2010 in Texel, Netherlands. The European pied flycatcher (Ficedula hypoleuca) is a small passerine bird in the Old World flycatcher family. One of the four species of Western Palearctic black-and-white flycatchers, it hybridizes to a limited extent with the collared flycatcher. [3]
The female lays a single soft-shelled, leathery egg 22 days after mating, and deposits it directly into her pouch. An egg weighs 1.5 to 2 grams (0.05 to 0.07 oz) [21] and is about 1.4 centimetres (0.55 in) long. While hatching, the baby echidna opens the leather shell with a reptile-like egg tooth. [22]
Great tit in Sweden, winter 2016. The great tit (Parus major) is a small passerine bird in the tit family Paridae. It is a widespread and common species throughout Europe, the Middle East, Central Asia and east across the Palearctic to the Amur River, south to parts of North Africa where it is generally resident in any sort of woodland; most great tits do not migrate except in extremely harsh ...