1 School of Psychology and Neuroscience, University of St Andrews, St Andrews, Scotland. Electronic address: clh42@st-andrews.ac.uk.
2 Budongo Conservation Field Station, Masindi, Uganda. Electronic address: walterakankwasa1@gmail.com.
3 Budongo Conservation Field Station, Masindi, Uganda. Electronic address: gmuhumuza@yahoo.co.uk.
4 National Forestry Resources Research Institute, Entebbe, Uganda. Electronic address: muwimbabazi@gmail.com.
5 Centre Suisse de Recherches Scientifiques en Côte d'Ivoire and Université Félix Houphouët-Boigny, Abidjan, Côte d'Ivoire. Electronic address: inza.kone@csrs.ci.