Just You and Me, Simpson Falls Track, Mt Coot-tha

Excerpt from https://www.wired.com/2013/07/why-are-these-caterpillars-climbing-over-each-other-the-surprising-science-behind-the-swarm/ :

"It's a group of caterpillars, moving in a formation known as a rolling swarm.

This entire rolling swarm of caterpillars moves faster than any single caterpillar can."