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Eggshell color is caused by pigment deposition during egg formation in the oviduct and may vary according to species and breed, from the more common white or brown to pink or speckled blue-green. The brown pigment is protoporphyrin IX , a precursor of heme , and the blue pigment is biliverdin , a product of the breakdown of heme.
The eggs vary in size from 28.8 by 20.9 to 33.5 by 23.4 millimetres (1.13 in × 0.82 in to 1.32 in × 0.92 in) and are variable in colour. Many are pale blue speckled with fine brown dots and resemble those of the common blackbird. Others are bright blue, with or without larger red-brown splotches.
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 ...
Speckled Egg Wreath. Capture the sweetness of Easter with this pastel-inspired wreath. It features plastic speckled eggs and a miniature birdhouse. Get the tutorial at The DIY Mommy. SHOP SPECKLED ...
The first recorded use of robin egg blue as a color name in English was in 1873, [3] though earlier references in English to colors similar to that of robin's eggs were made as early as 1844. [4] The "robin's egg" glaze appeared during the Yongzheng Emperor’s reign (1722-35) in China, and Yixing potter Hua Fengxiang made works with "robin's ...
The colour of the eggs seems to have evolved through the relatively good visibility of blue at low light levels. [50] The egg size is 26.5–34.5 mm (1.04–1.36 in) in length and 20.0–22.5 mm (0.79–0.89 in) in maximum diameter. [15] Eggs, Collection Museum Wiesbaden, Germany
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Cuckoos that target dunnock nests lay white, brown-speckled eggs, in contrast to the dunnock's own blue eggs. The theory suggests that common redstarts have been parasitised by common cuckoos for longer, and so have evolved to be better than the dunnocks at noticing the cuckoo eggs.