The primary reason for hunting was to supply the traditional medicine industry. Cat Ba langurs were used to make a "monkey balm" believed to help with erectile dysfunction and other health issues. Since the langurs are so few, hunting takes two to four weeks.
Hunting was mainly done to satisfy the traditional medicine industry's requirements. Langur monkeys were used to create a treatment known as "monkey balm," which was thought to aid in issues such as impotence and other health concerns. Given their low numbers, hunting can last anywhere from two to four weeks.