With the caveat that I know nothing about this topic (we've only had chicks for three weeks), I'd like to say that I'm pretty sure our "Agnes," who is much bigger and bossier than all the other chicks, is starting to crow at 3 a.m. It's not a full-fledged "cock a doodle doo." It's more like "ER ERRR" but it's so definitely not a peep, trill, coo or other chick-like sound. Could Agnes, now dubed "Angus" be a crowing prodigy? I thought this wasn't supposed to happen until 6-8 weeks!
Susan
p.s. I know it's Agnes/Angus because I tiptoed over to the brooder last night to see who was making that noise...Angus was sitting on his perch, looked right up at me, opened his little beak and squawked "ER ERRRR."