I two chickens, one of witch i am positive it is a hen, the other, silkie, i'm hoping is a hen but not sure. Well they are 17 weeks old, and today i went outside to find them making a sound i havent heard before. Its that "buck-buck-BIGOCK!!!!!" I'v heard of hens making this so maybe this means they are both hens. I never heard of roosters making this noise, so MAYBE THEY ARE BOTH HENS!!!!!