Information on reproductive parameters and social behaviour of the White-faced saki Pithecia pithecia is limited and new data reported here will be useful for the long-term management of the species and should prove useful to the maintenance of other more threatened pitheciines. A survey of 29 collections holding White-faced sakis has revealed problems associated with their reproduction and mortality which suggest that young are possibly being removed from their natal groups earlier than separation would occur in the wild.