One of my science scanners picked up this absolutely wonderful article co-authored by Charles Clarke on mutualism between the magnificent Nepenthes rajah and two species of mammals. In summary, a species of tree shrew (Tupaia montana) and rat (Rattus baluensis) both defecate into Nepenthes rajah pitchers while feeding on sugary secretions produced on the underside of the pitcher's lid. This type of behaviour has previously been demonstrated for N. lowii (link one and link two to the original research papers for N. lowii).
The full article (and a .pdf of the research paper) is freely available from this link:
Also be sure to see the high-resolution image of Rattus baluensis feeding on a N. rajah pitcher here (a very high resolution, 9 MB .tiff file is also downloadable from this link).
As if the research article and photograph were not enough, Charles was also good enough to upload three videos of Tupaia montana in action on pitchers of N. rajah and N. macrophylla onto youtube. They are embedded below for your viewing pleasure.
Nepenthes rajah video one:
Nepenthes rajah video two:
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