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I found this massive colony while I was working in Rockcliffe Park, Ottawa. The ants had dug a trench inside the tree. I spent a good hour just watching them take out miniature chunks of wood from inside the tree to a pile at the foot of the tree. It was quite amazing to see the these ants working so hard!
Every time I've seen these ants, they were inside wood. i.e.: Trees, wooden decks, wooden sheds and houses, garden retaining walls, wooden light posts, etc...
Can anyone tell me if those ants are the ones that swarm out of their nest during the summer creating clouds of flying ants??