I got a great deal on ducklings at the small animal swap today. Unfortunately, I don't know my duck breeds, and apparently neither did the seller. Any ideas what these might be? The 2 in the front both have orange and black marbled legs. The larger one in the back has back legs and a yellow belly. The itty bitty one in the corner has a little bit of yellow on his chest, black legs, and is half the size of the other 3, but at least a day older.