Tamarins are squirrel-sized monkeys that live mainly in South America (one species’ range extends out into Panama). Cotton-top tamarins (Saguinus oedipus) are endemic to north-western Colombia. I was the first person to study this species in the wild. This section shares an accessible record of my research and reports related to my cotton-top studies, including some made only in Spanish to Colombian officials and those published, some of which are linked to downloadable pdfs.