It also depends on the degree of mold in the bird's nest. If it is moderately moldy, it is not recommended to continue eating it, because the visible mold spots are all formed mycelium, and there are many invisible ones. Mold is growing, so to be safe, it's best to just throw it away.

If it is only slightly moldy, remove the moldy part and the remaining part can still be eaten with confidence. Of course, it is best to eat it quickly and do not continue to dry and preserve it. :

The main reason why bird's nests become moldy is due to improper storage. If the bird's nest is kept in a humid environment for a long time, it will give bacteria an opportunity to take advantage of the humid environment and the nutritional content of the bird's nest itself. The best breeding ground for bacteria.

Secondly, temperature is also a very important factor. A large number of bacteria will be active at room temperature, and psychrophilic bacteria will survive even in the refrigerator.

Reference: Sina.com Can you eat bird’s nests if they turn yellow?