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The markings are denser at the larger end of the egg, where they form an irregular cap. Some eggs are blotched with dark reddish-brown at the large end. They are about 0.76–0.84 inches (1.9–2.1 cm) long and 0.55–0.62 inches (1.4–1.6 cm) wide. [28] Three to four eggs is the usual clutch. [36]
Robin egg blue, also called eggshell blue or robin's-egg blue, [1] is a shade of teal (a blue-green color), approximating the shade of the eggs laid by the American robin, an abundant songbird of North America. The egg pigment is biliverdin, a product of the breakdown of heme. [2]
The American robin rejects cowbird eggs, so brood parasitism by the brown-headed cowbird is rare, and the parasite's chick does not often survive to fledging. [41] In a study of 105 juvenile robins, 77.1% were infected with endoparasites , Syngamus sp. being the most commonly encountered, in 57.1% of the birds.
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The larger American robin (Turdus migratorius) is a much larger bird named from its similar colouration to the European robin, but the two birds are not closely related, with the American robin instead belonging to the same genus as the common blackbird (T. merula), a species which occupies much of the same range as the European robin. The ...
The female robin will make the nest, and while she lays and incubates the eggs, the male will feed the female for a rest. Eggs are laid between early October and late December. A second clutch may be laid if the first is unsuccessful. The clutch size varies from one to three eggs, but two is typical. Eggs are creamy in colour with purple splotches.
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