Consistency with Marans is not there so much yet, so things can vary from one person's pens to another. Here I can usually tell very early on, and only occasionally will one surprise me. Its really just a matter of getting to know one's stock and how they develop.got it -- thank you! i'll keep an eye on them as they keep developing... and is there a particular age when one can often tell marans' genders, or does it vary too much to say? (my only other marans are two cuckoos, they were easy!)