Any photos of Dark Campbell ducks & drakes from ducklings to adults?

[solomon1707]

Hi,
We hatched out 2 Dark campbell ducklings from purchased eggs (we visited and collected on site and it was from Dark campbell hens with a khaki Drake) and have read they are supposed to be able to be sexed from down, Dark for boys and light/khaki for girls. Our 2 where pretty much black including bill and feet but with lighter facial markings. Feathers have just starting coming through and just wondered if anyone had photos of ducklings or growing just to help ensure the thought we have got boys as thought the bill would have started to get lighter by now based on looking at Dark campbell drakes? They are about 4 weeks old in photos.

Thanks