Being a Falconer I am always amazed at the aerial maneuvers of birds of prey. I have seen hawks and falcons catch prey in the thickest of brush and trees. I have seen Red Tailed hawks fly through grapevines and briars to grab a fox squirrel and not mess a feather. Harris hawks make me close my eyes when they fly through barbed wire fences at high speed. The following YouTube video does a great job of showing the ability of a Goshawk as it flies through a hole and a tunnel. I think you will enjoy it, Wild Ed