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en.wikipedia.org/wiki/Bird_egg

Bird eggs are laid by the females and incubated for a time that varies according to the species; ... Some birds lay eggs even when the eggs have not been fertilized; it is not uncommon for pet ... Birds which build in trees generally have blue or greenish eggs, either spotted or unspotted, while birds that build in bushes or near ...

www.sialis.org/blueeggs.htm

Mar 24, 2016 ... Just because eggs are blue doesn't mean they were laid by a bluebird. Bluebirds are cavity nesters, and VERY rarely lay their eggs outside of a ...

www.sialis.org/nests.htm

Jun 11, 2016 ... Eggs are powder blue (no dark spots), sometimes white. ... Cowbirds do not build their own nest - they lay eggs in the nests of other birds, ...

blogs.discovermagazine.com/seriouslyscience/2016/05/30/5415

May 30, 2016 ... While you might be most familiar with “robin's egg blue”, many species of birds lay blue-colored eggs. Why might this have evolved? Although ...

www.birds.cornell.edu/page.aspx?pid=1327

Instead, they lay their eggs in the nests of other birds. Cowbird eggs can come in a variety of colors. They can be white, blue, or green and most will have some ...

www.woodlandtrust.org.uk/blogs/woodland-trust/2016/05/identify-egg-shells

May 10, 2016 ... From blue eggs to speckled eggs. ... When spring is underway birds will begin to lay eggs, with several together called a clutch, into their ...

thebirdersreport.com/egg-and-nest-identification

I live in the United States and am only able to identify birds, eggs and nests of North ...... They usually lay 4 to 5 very pale to pale blue eggs, speckled, spotted or  ...

www.discoverwildlife.com/british-wildlife/see-it/how-identify-birds-eggs

May 6, 2015 ... Who laid that bright blue egg dumped on the lawn? ... them away, as do parent birds, often to help conceal the location of vulnerable babies.

www.sciencedaily.com/releases/2016/05/160527190410.htm

May 27, 2016 ... Scientists are testing the hypothesis that blue eggshells (unlike dark ... People have always wondered why many birds lay bright blue eggs.

www.discoverwildlife.com/news/why-do-so-many-birds-lay-blue-eggs

Aug 10, 2016 ... The question of why so many birds lay bright blue eggs has intrigued David Lahti since childhood – examples include the dunnock, the ...