This figshare package includes data and code for: Complex cooperative breeders: using infant care costs to explain variability in callitrichine social and reproductive behavior Samuel L. Díaz-Muñoz American Journal of Primatology (in press) If you are reading or using this, let me know how this data package was useful for you. Very interested in how people will use open data and open code. Always open to collaborate! Please contact me at the following email address: me ((at)) samdiazmunoz.org -Samuel L. Díaz-Muñoz If you use these data and code, please cite both the article and the figshare doi. CONTENTS code.R Code for the statistical program R, used to generate the figures and some statistics in the text. Using R version 3.1.3 (2015) callitrichine_data_complete.csv Data used to generate all stats and graphs. References for these data are below. The table from Digby et al. 2007 was OCR'd from PDF into electronic (text) format and curated by hand. Data on body masses from Hartwig 1996 were entered by hand. Digby LJ, Ferrari SF, Saltzman W. 2007. The role of competition in cooperatively breeding species. Oxford University Press:85–106. Hartwig WC. 1996. Perinatal life history traits in New World monkeys. American Journal of Primatology 40:99–130.