1 23 Primates ISSN 0032-8332 Primates DOI 10.1007/s10329-019-00773-6 Sexual dimorphism in the loud calls of Azara’s owl monkeys (Aotus azarae): evidence of sexual selection? Alba Garcia de la Chica, Maren Huck, Catherine Depeine, Marcelo Rotundo, Patrice Adret & Eduardo Fernandez- Duque