Thanks for bringing that up. With the preliminary web-search I've been doing, it seems that cottonwoods
and spiders normally exhibit the kind of activity theorized here
in the spring.
At this point, I don't believe what I'm seeing is either one of those.
Have you seen the cottonwood fallout before? Does it look similar to anything you have seen? Have you lived in the Dallas area for very long?
In teh summer I recall seeing cottonwood fallout in the country when driving, but no more.