I have 5 two and a half week old ducklings I got from an assorted breeds, straight run bin. There are 3 khaki campbells, 1 cayuga, and 1 blue swedish. When I got them they were all the same size and I believe they are all the same age because they are developing the same except that my swedish blue is huge! It's twice as big as the rest of them. At first I thought maybe the other breeds are just smaller, and while the khaki campbells are, I read the cayuga is about the same size as the swedish blue but my cayuga is the same size as the others. I would love to hear your theories on this as I don't know much about the swedish blue breed. Thanks!