i have 39 chickens and two roos ,i have two cages they are petty big ,sometimes i let them out so they can eat bugs and grass,i have a friend that her mother is sick so she is thinking to go to mexico for a couples months ,her husband and son will stay here,but they really dont care about chickens, she told me if i want all her chickens(16) but i noticed that she has all her chickens together and some are adult and some are young (maybe 2 0r 3 months old,and some of them are sick, so really dont want to put her chickens with mine because my chickens are very healthy,so i was thinking to build another cage for them because i really feel bad for the chickens ,my question is how far should i have to built the other cage so my chickens dont get sick i think her chickens have the flu i really dont know the name ,they can breath good . i really need some help