Thank you all for your replies.
I am now quite convinced that these are not Leghorns.
They are definitely all hens, I had a few roosters, that we ate. I am very sure about the age, as I got them at day-old. Very calm these chickens, not flighty at all.
Another photo would unfortunately not be...
Can anyone tell us the difference between a Leghorn and a White rock? Forgive me if I sound sceptical, but I need to be quite sure I have Leghorns. They were bought so I can have sex-linked chicks. I read that Leghorns are prolific layers. Then surely they should start sooner than 30 weeks...
So do white Leghorns lay white eggs? If yes, then maybe I will know the moment we have the first egg. I really thought laying should start at about 20 weeks.
These hens were sold to me as Leghorns (day-old). They are now almost 30 weeks old, still not a single egg. So now I'm having doubts - can someone tell me if they actually are leghorns?