I think one of my Call drakes is not feeling very well. He isn't taking real good care of himself for the last week and is just not himself. He eats and drinks and stays with the rest of the group of 6, but he just doesn't seem right ya know? And a few days ago one of the other drakes(I guess the top dog) was threatening this ill lookiing one with his beak opened. He doesn't feel thin or light or anything like that...I'm new to ducks though so don't know what to do. Should I give electrolites or an antibiotic or something?