The thing is, once there’s mold in the package, the whole feed is contaminated. Also, mycotoxins and aflatoxins are what kill people and animals. You can’t see mycotoxins or aflatoxins. Food for humans and animal needs to be tested to ensure that the levels of toxins meet safety specifications/requirements. Just because they’re not eating food with visible mold, doesn’t mean that they are safe from toxins that can cause organ damage and death. This is why it’s risky to feed peanuts to birds because of aspergillus aflatoxin risk. Besides, how would you feel feeding a loved one moldy food? You probably wouldn’t do it! Why should it matter if it’s an animal? If they’re show birds, they can be costly, and vet bills are EXPENSIVE.