I think that you are going to have to use your own judgement on this one, but I do not see anything to suggest that it would be unsafe for them. I have tow links that I have found for you, I actually found several but think that these two are the best ones. The first is from Web MD and everything is pertaining to humans, the second one is from Birds2U and shows birds including members of the parakeet family of parrots eating the leaves. Here are the links:
http://www.webmd.com/vitamins-supplemen ... me=MORINGAhttp://www.birds2u.info/moringa_oleifera_for_birds.htmDue to what I have read about this tree I would love to get some of the seeds to grow this plant in my home, primarily because of my increasing health issues and to see how my birds react to it firsthand. I am very intrigued with this plant, which doesn't happen very often as I am not a plant person. Do you live where I could get you to send me some of the seeds when they ripen, or should I just try and find the seeds online? Thank you very much for bringing this plant to my attention.
[EDIT] Was reading a bit more about this plant and the only thing that I have found that could be considered bad in any way is that you want to avoid using the root or anything made from the root as it contains a toxic substance in the root that appears to be only in the root.