Birds breathe in a lot. Do they produce a lot more of oxygen free radicals than mammals? And how do they cope with oxydative stress?
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There is some info on that here: Oxidative stress in ecology and evolution: lessons from avian studies
The article cites enzymes, antioxidants, brood size, serum analysis, body temperature, food types, membrane fatty acid composition, Vitamine E, carotenoids, and many other considerations. Perhaps you can read it and write an answer for us? Here is a summary:
Possible explanations for the higher longevity of birds compared to their mammalian counterparts are that birds have (1) a lower ratio of oxygen radical production and oxygen consumption, (2) an exceptional cellular resistance to oxidative stress, (3) a lower mitochondrial and nuclear DNA oxidative damage, (4) a lower cell membrane unsaturation and (5) a slower life history for a given body size