Between February and September of 2015, we visited different sites along the Leguízamo jurisdiction, as part of an ornithological survey and education project (Acevedo-Charry et al. unpublished data). During fieldwork, some mammals were recorded, not systematically, through direct observation, tracks and incidental captures in mist-nets, which served as evidence and were used for taxonomic confirmation. Specimens collected were deposited in the “Alberto Cadena García” mammal collection of the Instituto de Ciencias Naturales, at the Universidad Nacional de Colombia in Bogotá (Appendix 1 in Supporting Information). In addition, some species were recognized from informal interviews with local people and were included as potentially present but acknowledging the need for further confirmation. Our aim is to present these incidental mammal records as a contribution and support of the ongoing research in the Amazon region of Colombia.