i have 16 chickens. all different kinds. silkies, a couple bantams, a few game hens. anyway the last two days two of them have died. the one today was a bantam and when i went to feed her at 3 PM she was very lethargic and by 5 PM she was dead, yesterday she was perfectly healthy. i don't know if i could have some kind of disease that i should be worried about all the other chickens catching or what. maybe it is just some fluke, but the first one was only 8 months old and the one today was right at a year old. is there something i can buy and put in the water for a preventative? if you need more info please feel free to ask.