I'm really really confused about these ants. Basically they come to our home when grain is on floor or there is something sweet.
The lenth is around 7 mm - 10 mm. May vary a bit.
The front side is brown. Sometimes almost black. The last node is pure black and shiny.
They keep going inside soil and bring soil out.
When they bite you, they take tiny skin away.
Now, I read some articles and those confused me a lot. I read carpenter ants, black ants, black garden ants this and that. I can't find out which ant are these.
I've observed them in all cities I've visited. Pretty common. My area is Haryana, India.