We have a flock of 14, and I may be crazy, but I feel like some of them look skinny, and maybe feel thin when we hold them. I had a fecal/gram stain done today at the vet (a mixture of 4 different duck's poop), and it was negative/all good. They are all eating, I feed 18% feed, fermented in the morning and night, and some veggies/fruit, and they forage all day. Is it a molting thing, summer thing, or what? Is there anything else I should be looking for? I don't want to ignore a problem.