Currently we have Ms Ellie (F), and Orville (M) who together have not reared any chicks. However, a few years ago chicks were raised by Ms Ellie and another male, I cant recall his name, I believe it was Frank or Fred, something generic like that I believe. I would assume the current pair has bred before but I don't think the keepers interfere with the eggs and let them raise them on their own as there is no demand for ostriches in zoos. With that being said there have been many times before where the nests have flooded killing the eggs due to rain, etc.