While on a hike today in Sistiana, Italy, I saw an entire convention of caterpillars. One group was marching in a conga line on top of a wooden fence. The other group was further down the same length of the wooden fence and were gathered together in a mass. I have never seen anything like it. If anyone can identify these caterpillars and state if this is normal behavior, I would be happy to learn about it.
Looks like they’re the no touchy kind! https://www.google.com/amp/s/www.thelocal.it/20160226/northern-italys-trees-overrun-by-toxic-catepillar-cobwebs/amp