how are bird eggs usually cared for
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by body heat of parent they are cared and protected
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Birds, like other animals, know how to reproduce by instinct. This is the result of millions of years of evolution that has taught birds better ways to care for their eggs so that survival rates are higher. Archaeopteryx, the first bird with feathers, probably used the forelimbs and feathers to shield the eggs and offspring from harsh wind, rain or light.
In most avian species, parental care is given by both the parents.They developed the ability to provide protection, escorting, nurturing and egg guarding abilities for their young. Evolution of homeothermy and flight most likely occurred in bi-parental birds with precocial chicks.
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