I have a gosling question---I just had them swimming in the tub, and noticed that one of their skin is hot pink, and the others skin is dark, almost black. They are supposed to both be tufted romans? Also, I could hear their stomachs rumbling, or maybe just one of their stomachs, I have 2 about 2 weeks old. But the rumbling sounded like a cement truck when it goes around, or like rocks bing driven on, like a gravel driveway. I do give them grit, it just seemed odd and I really love these 2. Any ideas/opinions? jennifer