Hi @farmandadventure, it is definitely one of the bracket fungus :
But I don't think it is the Chicken of the Woods :
This page suggests some of the bracket fungus are deadly poisonous - so beware :
We get bracket fungi regularly on our birch and sycamore trees - but I haven't eaten one yet 😵
Thank you for your great comment! I braved the mosquitos to take a video: