1940 - No casualties of Dicerorhinus sumatrensis reported.
1939 - Estimate 15, including 7 young. One calf was seen. Herd well established, cf. Annual Report 1940
In 1940-41, the game warden C.E. Milner stated that Rhinoceros sondaicus no longer existed there.
Sanctuary notified in Ministry of Forest Notification no. 188 dated 9 July 1928 with effect from 1 September 1928. It is situated in the Pa-an township of the Thaton district and the Papun Township of Salween district. Are 62 sq miles.
1948. E.A.P. Reynolds, Divisional Forest officer, Mong nit division, visited in April 1948. He did not see any rhino, but saw fresh tracks of one and a month old spoor of a calf at heel. The Range officer who visited in May 1948, saw Dicerorhinus sumatrensis in a mud wallow.
Notified as game reserve in 1918 and declared a game sanctuary in Forest Department (Ministry of Forests) Notification No. 243 dated 22 July 1929 with effect from 1 Aug 1929.
A thorough investigation in 1938 by Theodore Hubback showed that at least some of the rhino were Sumatran. In 1939-40, F.J. Mustill obatianed definite evidence as an excellent view and a photo of a rhino in its wallow were obtained at very close range. The animal was undoubtedly of the Sumatran rhino and its track was the largest measured in the sanctuary.
