I've seen more of them around my back yard this year, and I'm wondering if something in the garden is attracting more of them. I've seen a bunch of them sheltering on a newly grown yucca plant during the day, at least.
I've seen more of them than usual this year, too. I haven't planted anything different, but I got guineas last year to help with our ground-nesting hornet problem, so maybe there are less predators for them in my yard this year?