Why do birds have to warm their eggs to hatch them, while reptiles, don’t?

Why do birds have to warm their eggs to hatch them, while reptiles, don't?

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Janmashtami Rangoli - Krishna Janmashtami Kolam, Krishnasthami Rangoli

Janmashtami Rangoli Designs And Kolam

Janmashtami Rangoli: One of the most popular art forms in India, rangoli (kolam) is drawn …

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