This study was conducted by Beatriz Luraschi during her time at Don Luis as a volunteer. Over 8 weeks, between mid-April and mid-June, 2018, different groups of black howler monkeys, Alouatta caraya, were observed in four different woodlands (montes) across Reserva Don Luis, in the Iberá Wetlands in the province of Corrientes, northern Argentina. A number of group dynamics and aspects of their behaviour were of interest, including group size and composition, and instances of grunting and howling, in particular as a reaction to human presence.
