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Yellowish brown ants that construct nests by weaving together leaves using larval silk. These ants are aggressive. And although weaver ants lack a functional sting they can inflict painful bites and often spray formic acid directly at the bite wound resulting in intense discomfort. I have first-hand experience on being bitten, and that was painful! They are called Hantik in the Philippines.
Hantik or weaver ants usually build their nests amongst the leaves of the trees. In our area, they are all over our mango trees. In Biñan Laguna, Philippines.