(Highlighted in Oct 21 issue of #ScienceMagazine)
as many as 12 unrelated #female #ostriches may lay eggs in one nest brooded by either sex. #males needed to ally with about #fourfemales to maximize #breedingsuccess. Females gained more from cooperation when clubbing together in larger groups of up to #sixindividuals. Intermediate group sizes tended to reduce reproductive success in both males and females.