A single specimen of the Roosevelt's muntjac or Roosevelt's barking deer (Muntiacus rooseveltorum) was presented to the Field Museum in 1929 following the Kelley-Roosevelts expedition organized by Theodore (Jnr) and Kermit Roosevelt. The specimen is slightly smaller than the common muntjac and DNA testing has shown it to be distinct from recently discovered muntjac species. It is a subspecies of Fea's muntjac, whose home range is mountains further northwest separated by lower land. However, without further evidence, the exact position of Roosevelt's muntjac cannot be stated.
There have been several recent claims to have rediscovered the species, from evidence including skulls owned by villagers in the Truong Son (Annamite) mountains between Laos and Vietnam. More recently, photographs from a camera trap at Xuan Lien Nature Reserve in Vietnam appear to have identified two individuals.
- Timmins, R.J., Duckworth, J.W. & Long, B. (2008). Muntiacus rooseveltorum. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 5 April 2009. Database entry includes a brief justification of why this species is of data deficient.
- "Deer supposedly extinct 85 years ago discovered in Vietnam". Thanh Nien News. March 6, 2014. Retrieved March 7, 2014.
- Rediscovery of Roosevelt's Barking Deer (Muntiacus rooseveltorum), George Amato, Mary G. Egan, George B. Schaller, Richard H. Baker, Howard C. Rosenbaum, William G. Robichaud, Rob DeSalle, Journal of Mammalogy, Vol. 80, No. 2 (May, 1999), pp. 639-643 
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