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there is one of the 7 that is smaller then this.
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Same guy from above next to a buff orphington - they are all supposed to be the same age.
That looks about right to me, for a bantam and a larger breed.
The size difference tends to become more obvious as they get older.
The bantams start smaller, grow slower, and usually mature at a younger age.
The other chickens start larger, grow faster, and usually keep growing for longer, which all adds up to quite a difference in size by the time they finish growing.
I do not like the pea or rose combs
In that case, you may not want to work with those cockerels.
There is a link between the gene for blue egg color and the gene for pea comb.
They can be linked in any combination:
blue egg/ pea comb (Ameraucana, many Easter Eggers, probably your cockerels)
blue egg/not-pea comb (Your hen, Cream Legbars)
not-blue egg/pea comb (Brahmas, Buckeyes)
not-blue egg/not-pea comb (Leghorns, Rocks, Wyandottes, most other breeds)
But if you want single combs, and you want blue or green eggs, you will want to work with chickens that have the blue egg gene linked to not-pea combs. Your current hen, Cream Legbars, and I think Whiting True Greens could be good choices. Also some Olive Eggers that get their blue egg gene from Cream Legbars.