Yeah, I was just going by the ones I got in the mail and the later batch I hatched out. The hatchery chicks had different colored spots painted on their heads, so, I figured they must have sexed them by vent inspection, or, they wouldn't have bothered to take the time to mark them.
The ones I...
I'll have to check it out, as I don't remember any of my cockerels having sex linked marking, or, being different from the females. It sure would by handy, though.
One of the discussions I ran across on here:
https://www.backyardchickens.com/t/670508/cuckoo-marans-hens-or-cockerels...