Yes, they do make huge nests. The nests are removed as soon as possilbe after the young fly away. But they are not colony animals, either.
Some places do set up boxes/platform atop utility poles for nests. These poles and the platforms are designed to handle the load, and the cables are far enough away from thenests where it's not a porblem.
So it is the colony characteristic that is the difference?
Still not happy about it. But I understand a little more at least.
Thanks.