These ants are farming insects (probably scale insects)  for honeydew  on a Ficus virens growing on the hill behind Fort Margherita in Kuching in December 2017.

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Despite the large size of the Ficus virens  fig tree we could only find one small group of farming ants on the tree.
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Growing next to the Ficus virens tree was a Ficus heteropleura  fig tree with branches intertwined. This was a male tree with a few ripe male figs remaining on the tree. There were two species of ants associating with the male figs.

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There were ants associating with the Ficus hetropleura as well. They appear to be drinking surface water from the leaf surface.