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Bird eggs laid in cold climates are darker, which may keep eggs warm

A global survey of bird egg color reveals a simple trend: the colder the climate, the darker the egg

bird eggs

Bird eggs come in a wide variety of shapes, sizes and colors. A new global study suggests that northern birds in colder climates tend to have darker eggs.

Frans Lanting/MINT Images/Science Source

By Jonathan Lambert

- More than 2 years ago

Bird eggs come in a dizzying array of colors.