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- Black howler monkey (Alouatta pigra) activity, foraging and seed dispersal patterns in shaded cocoa plantations versus rainforest in southern Mexico-. American Journal of Primatology. 76:890-899. 2014
- Use of space, activity patterns, and foraging behavior of red howler monkeys (Alouatta seniculus) in an Andean forest fragment in Colombia-. American Journal of Primatology. 73:1062-1071. 2011