Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Diet of the Red Howler Monkey (Alouatta seniculus) in French Guiana, C. Julliot and D. Sabatier, International Journal of Primatology, Vol. 14, No. 4, 1993, pp. 527-550