I purchased ten 'ISA Brown' chicks. Two were white as they began to mature, and I no longer have them, as I cannot have roosters. I still have six brown ones - supposedly the 'hens', and they are about 6 months old now. This morning one of the larger ones began making 'crowing'-type sounds. Sounds like halfway to a crow. Hermaphrodite??? I told this breed was easily identified in regards to sex, that the males are white (which two of ours turned out to be) and the females are brown. What's up?