In the world of the large featherless beings, “free climbing” up or down the side of something is considered a really big deal.
It is a sport, in fact, and those who do it are celebrated for their courage and athletic prowess.
Perhaps this is because, lacking either wings or claws, it is a legitimate wonder a featherless being can make it up or down the side of anything without falling right off.
But all that changes when you have feathers. For featherless beings, you are born knowing that free climbing is in your DNA.