This is Hedvig Hen-Chick showing off her pin feathers. This photo was taken when she was three weeks old (and she is now almost six weeks). I am guessing they are called pin feathers as I found this website about “What is a pin feather?” and it says “A pin feather is quite simply a new feather at the beginning stages of growth.”
So I am learning such a lot having these chicks. Not that I really need to know what a pin feather is. It is not as if the subject of pin feathers will ever come up at work or at a party but at least if it ever does, I can be slightly knowledgeable.