Ecology of sympatric gibbons.

Ecological compatibility of sympatric gibbons is achieved by a difference in diet resulting from the effect of differing body sizes on the efficiency of harvesting different foods. In addition, differences in feeding apparatus and body size between the large and small species maximise the rate at which each can eat its most eaten food type. Parallels exist between the species array of gibbons and that of the African apes in the relationship between body size and ecology.