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Kloss gibbons are the same size and live in the same type of habitat as several other gibbon species, and consequently its diet would be expected to be similar to its closely related congeners. The diet is described in terms of the weight of food items, faecal remains, and time devoted to different foods. Aspects of feeding behaviour are then examined, such as changes in food choice through the day, the relationship between fruit size to feeding bouts and feeding rates, and the effect of forest type quality on ranging. A comparison is made between gibbon species. The diet of Kloss gibbons appears to differ from that of other gibbons in that it contained no tree leaves, and arthropods were a major part of the diet. Possible reasons for this are discussed.

During the course of a recent compilation of information concerning the natural history of Sulawesi, Indonesia, it became apparent that there were no recent records of the endemic Caerulean paradise‐flycatcher Eutrichomyias rowleyi and few of the endemic species of the fish family Adrianichthyidae. Efforts were made to confirm the continued existence of these animals but without success, and while it is impossible to be certain, we suggest that these species, and perhaps others from their communities, may be extinct or iritically endangered It is of great concern that none of the species discussed has ever been mentioned in the IUCNRed Data books, and it is suggested that further species in the endemic‐rich area ofWallacea may also have become extinct in the last few decades.

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