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birds in cooler climates lay darker eggs to keep their embryos warm

  • Written by Phill Cassey, Assoc Prof in Invasion Biogeography and Biosecurity, University of Adelaide
birds in cooler climates lay darker eggs to keep their embryos warmThe colour and brightness of birds' eggs plays a key role in keeping them at the right temperature.Anne Kitzman / Shutterstock

Birds lay eggs with a huge variety of colours and patterns, from immaculate white to a range of blue-greens and reddish browns.

The need to conceal eggs from predators is one factor that gives rise to all kinds of...

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