Why do baby birds die inside the eggs?

Baby birds can die inside their eggs for several reasons, including inadequate temperature and humidity, which can hinder proper development. Genetic defects or health issues may also contribute to mortality during incubation. Additionally, if the parent birds are unable to provide sufficient care, such as consistent warmth or protection from disturbances, it can lead to the embryos dying in the eggs. Environmental factors or contamination can further compromise the developing chicks.