posted 5 years ago
Yeah, I am pretty sure these were introduced as a biological control and eventually got out of hand. Actually the day was sunny, warm and beautiful.
I once read that they only swarm like this when it was a warm day that followed several cold days. The gist was something like they had been tucked in for the winter but the warm weather unexpectedly woke them up. The reasoning then says that the swarming action is a desperate attempt to find some other place to hide as their previous place is too warm and they are actually dying of heat which is why they want inside the house and only swarm on the sunny side of the house.
I don’t know if this is correct, but it would seem to explain their behavior.
Eric
Some places need to be wild