Freire Filho, R.G., Pinto, T. and Bezerra, B.M. 2018. Using local ecological knowledge to access the distribution of the Endangered Caatinga howler monkey (Alouatta ululata). Ethnobiology and Conservation. 7, (Aug. 2018). DOI:https://doi.org/10.15451/ec2018-08-7.10-1-22.