Could be the Oak processionary: en.wikipedia.org/wiki/Oak_processionary

Thank you for your comment, UdoSm. They are very similar in appearance and behavior. I should have mapped the image. It was taken in Mississippi, USA. The oak processionary is found only in Europe.

OH!
So many!!
Spectacular image, Ronald!!

Thank you very much, J. García. I passed several oak trees with whose leaves had been eaten before I came to this one.

An amazing sight well recorded Ronald.

Thank you very much, Doug.

A party at the same time as a feeding frenzy!
Great capture!

Good comment, Andy. It was definitely a feeding frenzy.

Ça ressemble à une vraie colonie de vers à soie.

I didn't see much silk, but the colony had eaten all the leaves on several small oak trees near this one. Thanks for the visit, Malik.

Impressionnant !

Merci beaucoup, Nathalie.

WOW! so many of them....another well taken shot, Ronald... Sarah

Thank you very much, Sarah. I hope you don't get an infestation of these. So far they're only eating young leaves on oak trees.

A fascinating shot captured in what looks like challenging light..............the details and sharpness are excellent Ronald. I hope you get to see some of the moths in due course...........I had a look online at some photos and they're beautiful.