one of my chicks smells like....tomato soup?

[reesechickpic]

I have 15 six day old chicks and I was hanging out with one today when I realized it smelled funny. we identified the smell as tomato something. soup, paste, sauce. sweet tomatoey. they are eating chick starter, I started putting ACV in their water 2 days ago but none of the others smell like that. I'm wondering if its something in her gut? or just a weird smell? she seems to be acting fine. thanks!

 

[ShannonR]

Please pass the salt and pepper.

Seriously though, I dunno. Check to see if the smell is coming from inside the mouth?