Subject	Ecology
Specific subject area	Ecology and animal behaviour.
Type of data	JPG Images and Table of Metadata (csv file)
How the data were acquired	The photographic portraits were acquired on wild mandrills daily monitored in their natural environment, using different models of digital SLR cameras equipped with a long-focal lens (varying from 70 to 500 mm depending on camera models and distance to the subjects).
Data format	Raw (JPG)
Description of data collection	The Mandrillus Face Database contains 29,495 portrait photos of wild mandrills taken between 2012 and 2021, stored in jpg format with a 224 × 224 pixel resolution. These individuals are daily monitored by field assistants, who take pictures and record individuals’ identity directly in the field. Pictures are taken on both sexes of all ages (infants, juveniles, adolescents and adults). Data were normalized by manually cropping faces and rotating images to align the eyes along a horizontal line.
Data source location	· Institution: Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), UMR5175, University of Montpellier/CNRS/IRD/EPHE, Montpellier, France Institut des Sciences de l'Evolution de Montpellier (ISEM), UMR5554, University of Montpellier/CNRS/IRD/EPHE, Montpellier, France · City/Town/Region: Lékédi Park, Bakoumba (GPS coordinates: -1.7974667244585478, 13.020375049984194 - accuracy:10 km) Country: Gabon
Data accessibility	· Repository name: Mandrillus Face Database Data identification number: 10.5281/zenodo.7467318 · Direct URL to data: https://doi.org/10.5281/zenodo.7467318