Nine individual Alouatta caraya and Sapajus cay displaying facial malformations were observed across three sites in Paraguay. Six had cleft lip (with or without cleft palate), and three had malformations of the lower lip. This is the first record of cleft lip and/or palate in the genus Alouatta.
Keywords: Alouatta; Sapajus; Central and South American primates; cleft palate; congenital deformities.
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