Rare mammals recorded in Borneo – Malaysia

While on a wildlife-watching trip to Sabah, Borneo, May 21 to June 5, 2011, Jeffrey Harding and I saw several rare and endangered mammal species whose distributions are not well known. Following is a list of the rarest ones with notes on location, elevation, and conservation status. Elevations were taken with a Barigo altimeter. Conservation status notes are based on IUCN (2011). Taxonomy follows Wilson & Reeder (2005). Evidence included field notes and photographs for most species mentioned below. I offer these notes in case they may be of use in future conservation efforts or distribution studies.