I have a book, "Good Parrotkeeping", by Robin Deutsch. In it she claims that garlic IS a good food item, as it "has antibiotic and antitumor properties; stimulates the immune system and kills parasites; help eliminate lead, zinc, and other toxins in the body". I do not know what her source is for this info. Contrast this with the latest BirdTalk magazine, Oct 2011 issue, and the article "Toxic Foods", by Margaret Wissman, a DVM and DABVP-avian practice. In it she states that, since both onion and garlic contain aromatic sulfuric compounds that have the "potential" to cause anemia in birds, it is best to not offer any of these items to our birds. I believe it best to err on the side of caution and forgo any onion or garlic, as my birds have quite a varied palate without those anyways.