Notes on pregnancy,delivery, and infant survival in captive squirrel monkeys

A survey is given on 13 pregnancies in captive squirrel monkeys including 3 reported elsewhere. Observations of sexual behavior suggest a gestation period of 24 to 26 weeks which confirms former estimations. In 8 pregnancies the presentation of the fetus was determined by X-ray and measurements on fetal growth are given. Three deliveries were observed and motion pictures in artificial or infrared light were taken. Behavior and physical changes during pregnancy, and behavior of mother, infant, and group members during delivery and early postnatal period are described. Of the 6 live born infants 4 did not survive the weaning period and 2 have not yet been weaned.Attempts to provide the monkeys with sufficient protein and to eliminate accidents are discussed.