(Credit: Sara López Gilabert/SAPIENS)

It is early morning on a wide plain in Amboseli National Park in southern Kenya. With a small Dixie cup and a wooden tongue depressor, Susan Alberts picks up a fecal sample left by a female baboon named Yoruba.

Alberts is an eminent primatologist. She is both the chair of the department of evolutionary anthropology and a member of the biology department at Duke University, and the co-director of the Amboseli Baboon Research Project. But this morning,