These are my 2 Mallards, Faux-Gras and Sally. One looks as though there may be a bit of crested somewhere down the line, as it has a funny little feather puff on one side of it's head. This is my crested duck "Mo" They were all hatched at the beginning of April. Both mallards have the purple/green wing tips. Both have lighter necks but there is no identifiable "white ring" at the base of either. At what age does it show up, and the green feathers? Thanks!