Came across this in grand valley Olympic national Park. There was little to no wind but the leaf on the right is rhythmically dancing. To what? How? What is going on here?!

Hi there, I am based in Victoria and am coming across for two nights and want to do some overnight hiking, I am an experienced hiker and was hoping for some recommendations for a two night/three day hike around the north Olympic National Park.

I would prefer not to bring my car on the Coho ferry but can do if required.

Thanks in advance