I just got 3 new chicks yesterday. 1 light Brahma, 1 speckled Sussex, and 1 black Cochin. The light Brahma and the speckled Sussex are really energetic and run around but the Black Cochin is usually sleeping or just standing in one spot. It still eats and drinks and chirps like the others but it just acts so much different than the other two. Is the black Cochin breed just more docile and quiet or does it maybe have a disease?