The name of the ant is Oecophylla smaragdina. This formicary was build by bending leaves and glue them togeter by using the silk produced by their larves. Their larves are used with their silk as a kind of hot glue gun. They are living by eating other insects or carrion. My Indian colleague was telling me, to keep away from the ants. The reddish color is a warning signal, that the bites will hurt very much.
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