1 out of 5 of our 3 week old chicks has a personal body odor issue. More precisely, her head has a strange funk to it...yes, we sniffed each chick all over () and it's only on her head/neck. None of the others exude anything like it. I first noticed it about a week ago, and it really hasn't changed (gotten better/worse, altered otherwise) since. The odor itself is a little hard to describe...somewhat reminiscent of cecal poop, but not nearly as as potent or gag-inducing. She's mostly fluff on her neck and head, though does have visible pin feathers working their way in. There's no evidence of feather fouling of any kind, no infection, parasites, injury, disease, etc. She's eating/drinking well and behaving and pooping normally. Her crop seems normal, not bloated or hard. She also appears to be the emerging lord of the flock (everyone else comes at her beck and call and generally follows her around). Any ideas on what this could be and/or how to remedy it? Thanks!