The forest musk deer (Moschus berezovskii) is a solitary ruminant in family Moschidae and is found in central and southern China and northeast Vietnam (Wang & Harris, 2017). In Vietnam, the distribution of forest musk deer is limited to the Lang Son, Cao Bang, and Thai Nguyen provinces (Dang et al., 2008). Forest musk deer has been assessed as Endangered on the IUCN Red List of Threatened Species (IUCN, 2021), and Critically Endangered on the Vietnam Red Data Book (MOST & VAST, 2007). The main drivers of the decrease in its populations are poaching for musk and ongoing habitat loss (Wang & Harris, 2017). Almost nothing is known about forest musk deer in Vietnam. The most recent information on the species is from the 1990s and estimated the population of 83 individuals in Huu Lien NR (Dang & Nguyen, 1999). However, this estimate was basically based on expert assessment, and not on robust data or survey methodologies. After several decades without any information on the species, our team detected an adult forest musk deer in Huu Lien NR by camera traps at the beginning of 2021 (Tran et al., in prep). The results prove inconclusively that forest musk deer still survives in Huu Lien NR.