Ants on the Move...

At this time of year, we sometimes notice large groups of (tiny) ants on the move...

Have they outgrown their nest?

Have they multiplied so much over the summer that they need to form a new colony?

I don't know, but we caught these spilling over the driveway.

If we try to get rid of them, are we unbalancing nature?! It's hard to know what to do!