Is it because they are more domesticated than other birds? So far my chickens have had... Dry Fowl Pox Scaly leg mites Infection Bronchitis Eye infections Fungal infections on the comb and wattles Wet fowl pox Coryza Also they have suffered with..... Injured legs Dog attacks Roosters fighting injuries. Drowning in pond I keep the following bird species also, which are never sick or ill (except one parakeet with scaly leg mites which recovered fully). Guinea fowl Quail Budgies / parakeets Domestic ducks Finches Fancy pigeons Ring neck doves Zebra doves Golden pheasants Cockatiels I am getting really stressed out about my chickens and am thinking of stopping keeping them. I know its not anything \I am doing wrong... they have huge clean pens, top quality food and clean water with ACV in it.. Also fresh air and shelter from rain and sun.. and they are not overcrowded or stressed. They are not inbred either.