The mandrill exhibit at the San Francisco Zoo. (photo courtesy of Marcia Brown)

SSUPER research assistant Marcia Brown recording mandrill behavior. (photo: Karin E. Jaffe)

Adult male mandrill. (photo courtesy of Marcia Brown)

Brieanna Richards (left) with SSUPER Research Assistants Rochell Garman and Kevin Knowles at the Safari West ring-tail lemur exhibit.. (photo courtesy of Brieanna Richards)

SSUPER Research Assistants Kevin Knowles (left) and Rochelle Garman recording ring-tail lemur vocalizations. (photo courtesy of Brieanna Richards)

SSUPER Research Assistant Kevin Knowles using a directional microphone to record ring-tail lemur vocalizations. (photo courtesy of Brieanna Richards)

Green monkey exhibit at the Oakland Zoo. (photo courtesy of Shannon Hodges)

Adult male green monkey. (photo courtesy of Shannon Hodges)