I've looked around and I haven't seen this discussed in a dedicated thread or article. I know a lot of coloration and pattern genes alter the appearance of chicks. For example, chipmunk stripe indicates wild type plumage, yellow chicks have either dominant white or recessive white, and black chicks with a white spot on their heads usually end up cuckoo. What else can be determined just from looking at chicks? What other mutations are visible from hatching? If there's a visual guide somewhere, I'd love to be pointed in the right direction. I'd also welcome anyone sending pictures of chicks with interesting phenotypes and chick to adult transitions. Thanks! 
