(A FACS system adapted for Common marmosets)

What CalliFACS is:

The CalliFACS is an observational tool to identify and measure individual facial movements in common marmosets (Callithrix jacchus). It follows a similar methodology used originally to create the human FACS (Ekman et al 2002) and all previously developed AnimalFACS. The CalliFACS combines information from facial anatomy with the visible changes on the face of common marmosets to classify facial movements into Action Units (AUs). The CalliFACS manual trains users of this tool to identify each facial movement and the CalliFACS test allows users to become certified in coding facial movements in common marmosets.

More info regarding the development of this FACS system can be found here:

Caeiro C, Burrows A, Wilson D, Abdelraman A, Miyabe-Nishiwaki T. (2022) CalliFACS: The Common Marmoset Facial Action Coding, PLoS ONE System. 10.1371/journal.pone.0266442


CalliFACS is not an ethogram of facial expressions, and does not make any inference about any underlying emotion or context causing the movement. Instead this is an objective coding scheme with no assumption about what represents a facial expression in this species. It will not explicitally teach you about prototypical marmoset facial expressions. 

What CalliFACS isn't:

Accessing the manual

Accessing the Test

To access the CalliFACS manual, please fill out the form below. Further details, including a link to the manual, will be sent to the email which you provide. 

If you do not receive the manual within 24 hours (this is usually instant) please contact us. 

To become a certified CalliFACS coder, we encourage you to take the associated test. The CalliFACS test involves trainees to accurately code the facial movements in a series of video clips.

The materials for the test, and further instructions, can be found with the manual, and can also be accessed via the form below. 

The people behind it

CalliFACS was developed thanks to the effort of:

  • Catia Correia-Caeiro, Primate Research Institute, Kyoto University, Inuyama, Japan
  • Anne M. Burrows, Department of Physical Therapy, Duquesne University
  • Duncan Andrew Wilson, Primate Research Institute, Kyoto University, Inuyama, Japan
  • Abdelhady Abdelrahman,School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, United Kingdom
  • Takako Miyabe-Nishiwak, Primate Research Institute, Kyoto University, Inuyama, Japan


We would further like to thank: The Primate Research Institute, Kyoto University (KUPRI) and the Center for International Collaboration and Advanced Studies in Primatology (CICASP) for hosting CCC during this work; The staff at the Centre for Human Evolution Modelling Research, KUPRI for the care of the common marmosets; Dr. Claire Watson and Prof. Hannah Buchanan-Smith for permission to use the videos hosted on; The owners of videos hosted online on and for permission to use the videos or for having videos marked with CC (Creative Commons Licence): Brave Wilderness, Oleg Pavlov, and MomoMyMarmoset.