I've recently noticed my 18 month old Wyandotte regurgitates fluid when she bends down to eat. I've only noticed this in the morning (I usually give them scraps when I let them out in the morning to free range--grains, vegetables, stuff like that). She will bend over to peck at the food, but fluid will flow out. She seems to do this a few times, then the fluid stops (maybe she has drained it all?) and can start pecking. She seems okay otherwise. And, I say "seems ok" because she is quite plump, but she always seems a bit more sluggish than my others, eyes seem to be a bit droopy and not wide open, doesn't forage as much. BUT, her sister also seems to be the same way, so I've always assumed that was breed characteristic and not sickness (my other chickens are a Barred Rock, a White Rock and three sex-link's although I don't know what their mix is). Is this something I should be worried about?