This is my guess...?

[Crs1]

Cockerel
Pullets
These are black Orpington. Beautiful chickens
They are 16 weeks old and the one I think is a cockerel has never uttered a cocka doodle doo. But as you can see his comb a wattle are larger and more red than the other two and he is a big bird
What do you think?

 

[JedJackson]

I agree with you. The cockerel has the beginnings of male specific feathering, in addition to the large red comb and wattles. The other two are pullets. All are beautiful birds.

 

[Crazy for Chickens!]

Cockerel
Pullets