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Eggs are 14–18 mm (0.55–0.71 in) long and 10.7–13.5 mm (0.42–0.53 in) wide. Egg size appears to depend mostly on the size of individual females and secondarily on habitat, with smaller eggs found at higher altitudes. The clutch's total weight can be 1.5 times as heavy as the female bird. [22] Juvenile in Pimlico, London
Birds which build in trees generally have blue or greenish eggs, either spotted or unspotted, while birds that build in bushes or near or on the ground are likely to lay speckled eggs. The color of individual eggs is also genetically influenced, and appears to be inherited through the mother only, suggesting the gene responsible for ...
Published in 1980 by Rigby of Adelaide, South Australia, in its series of field guides to Australian natural history, the book is 190 mm high by 130 mm wide.It consists of three parts; Part One contains general information; Part Two contains separate keys to the identification of nests and eggs, as well as the colour plates that illustrate them; Part Three, comprising three-quarters of the ...
The great blue heron (Ardea herodias) is a large wading bird in the heron family Ardeidae, common near the shores of open water and in wetlands over most of North and Central America, as well as far northwestern South America, the Caribbean and the Galápagos Islands. It is occasionally found in the Azores and is a rare vagrant to Europe.
Bluebirds lay an average of 4 to 6 eggs per clutch. They will usually brood two or three times in a year. Bluebirds nest from March all the way through August. Bluebirds have blue, or blue and rose beige, plumage. Female birds are less brightly colored than males, although color patterns are similar and there is no noticeable difference in size.
This bird is resident in western and southern Europe and southwestern Asia, while northeastern populations migrate south and west in the winter within the breeding range and also further south to Iberia and North Africa. The common starling builds an untidy nest in a natural or artificial cavity in which four or five glossy, pale blue eggs are ...
The tree swallow lays a clutch of two to eight, although usually four to seven, [14] pure white, and translucent at laying, eggs that measure about 19 by 14 mm (0.75 by 0.55 in). [53] These eggs are incubated by the female, [14] usually after the second-to-last egg is laid, [54] for 11 to 20 days, [53] although most
The eastern bluebird (Sialia sialis) is a small North American migratory thrush found in open woodlands, farmlands, and orchards.. The bright-blue breeding plumage of the male, easily observed on a wire or open perch, makes this species a favorite of birders.