Over the years I've had to remove raccoons dened up in an attic. At this time of year, it's always a group of boars. I'll pull anywhere from 2-6. This January I've had two calls, the first had five boars, the current job had 3 so far, until today, when I had a Sow going in. Using 160 Belisle at a dome attic vent.
I just finished telling my customer that it will be another Boar, because I've never caught a Sow at a boars den.
So, was wondering if it's unusual for you guys to get a Sow right now, or is it unusual that I don't get more sows? And do the sows go to the boars when in estrous? I've always assumed the Sow will den alone and the boars will look for them, just like skunks.
I probably average less than three dozen raccoons a year, including pups during the birthing season.

My thought is the sow does not want the boars to know where her den is located. She’ll be bred away from the den site and return when it is time to give birth. My understanding is a female will not poop in the attic for fear it could draw a male in who will destroy her kits.

Interesting theory, makes sense. Thanks