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Most of these ants don't look green, but some are fully orange like the ones pictured above. These aggressive arboreal ants that use larval silk to weave together leaves to form their nesting cavities like seen in Picture 3. A mature colony of Oecophylla smaragdina can entirely dominate a tree (sometimes several) with nests distributed throughout their heavily defended arboreal territory, in this case this mango tree, which has multiple nests. Note, that when they are agitated they smell bad, and when they bite they latch on good.
Can be found in mostly subtropical climates, mostly in the Himalayan foothills of India and Nepal, southern China, northern Vietnam, and the southern coast of Queensland, Australia. Almost all these sites are classified as dry winter subtropical climate. A few Oecophylla smaragdina sites are classified as having Arid climates, all from warm semi-arid areas.
If you look closely on picture 3, you can see the eggs and the silk structure that hold together the nest. This nest was located in Puttur, Karnataka.