I have a flock of Big Chickens (LF) about 8, 9 months old with a couple hens who were a year in March, plus four 16? week old pullets (3 LF and a bantam cochin), plus 4 bantams of 3 different breeds just 10 weeks old. The Bigs sleep in their own coop, the Middles sleep in their own coop, and the Littles sleep in the Duck House (because the ducks never slept in it even once).
This morning, as the rooster (a Big Chicken) crowed after he came out of the Big Chicken Coop - using the automatic door - I heard a responding, baby crow from within the Duck House. Adorable as heck. But the suspect did NOT crow again when I let everybody out!
It's got to be one of the Sebrights. *sigh* I hate waiting to learn genders.