Is it safe to eat a duck egg that is green inside?

Under normal circumstances, greenish color inside duck eggs is safe to eat if it's the natural color of the egg white; however, if there are signs of spoilage or an unusual odor, the egg should not be consumed. If in doubt, it is recommended to consult a healthcare professional in advance. Detailed analysis is as follows:

In some cases, the egg white of certain duck eggs naturally appears slightly greenish. This is a natural phenomenon caused by breed characteristics or feed components and does not indicate spoilage. Such eggs have intact shells without cracks or damage. When opened, they show no sour or rotten smell, and the yolk is plump and elastic. These eggs are safe to consume and do not harm health, providing normal nutritional benefits such as protein and minerals.

However, if the greenish color inside the egg is accompanied by obvious abnormalities—such as cloudy, sticky egg whites, broken or scattered yolks, or sour, putrid odors—it indicates bacterial growth and other harmful substances, meaning the egg has spoiled. Consuming such eggs may cause gastrointestinal discomfort, including symptoms like abdominal pain, diarrhea, and vomiting. In these cases, the eggs should be discarded immediately and not eaten.

When selecting duck eggs, examine the shell condition and pay attention to color and smell after cracking them open. Naturally greenish eggs can be safely eaten as long as they are thoroughly cooked. Any signs of spoilage should prompt immediate disposal.