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Ficus megaleia growing at Bukit Patoi near Bangar, Temburong, Brunei. A close look indicates that many of the leaves have been partially eaten by some folivorous insect. All photos taken by Arlene Walshe  in March 2019
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Many of leaves have suffered damaged similar to the leaf shown above.
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Note that the thin bark covering the main vein has been almost stripped clear.

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There were numerous black ants living in the hollow twigs. Note the  brown access slit in the twig in the photo above. But what are the ants feeding on ?
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Note the swollen petiole (leaf stalk)  used for housing (domatia) by the ants
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The ants are tending a bizarre black caterpillar on the underside of the leaf. Presumably the ants are feeding on some product produced by the caterpillar.

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