Red-winged blackbirds lay pale blue-green to gray eggs with black or brown markings in their marsh nests. Other local nesters with some blue-tinted eggs include house finches and gray catbirds.

When it comes to bird eggs, most people imagine the standard brown or white varieties. However, nature has a surprise in ...

To crack the structural secrets of the eggs’ ceramic appearance, Hauber and his colleagues first attained green, blue, light brown and dark brown eggs from four species of tinamou kept by the ...

Birds that don’t have plain white eggs will often be ones that put their nests on the ground and they’ll have speckles on them, little brown speckles or other colored speckles, so you could ...

Host birds reject brown parasitic eggs more often the blue-green eggs. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2017 / 02 / 170208094428.htm ...

Easter Egg. The First Colored Eggs Appeared Long Before Easter The dinosaur ancestors of birds laid blue, brown, and speckled eggs as far back as 150 million years ago.

For example, the sickle-clawed predator Deinonychus had a blue egg with brown blotches and the bird-like Oviraptor, known for its toothless beak, had eggs that were dark blue.