I was about to type, yep that's what you have there.
I battled the gypsy moth for several years when I worked in a Dept. of Agriculture field lab.
Ie, I've seen millions of them. izzy: I've walked in forests where it sounded like a light rain, but was really the sound of their droppings, etc. falling through the leaves.
We did research into biological control of them. Predators, parasites, diseases and pheromones. The latter I was once covered with by accident, leading to my being followed around by male gypsy moths for weeks.
For what little it's worth, I tend towards disagreeing with spraying. It only knocks them down temporarily and kills too many of the native critters. Or should I say I wish there was a viable alternative.
Amazing that 30 years later we are still fighting them.
PS, do not touch them or allow animals to. Those hairs will go right through your skin.