Yes!! These are Ant Houses :)
If you look closely, you can see the red ants in the photos.....
I didn't dare go too near and click photos since these ants were moving about anywhere and everywhere....
And if you get a teeny weeny bite from them you will not forget them for a loong time....
In the Malenadu region of Karnataka, some tribes of people make a chutney of these ants with chillies, salt and lemon and eat them. They believe that these are good for health.....