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When you first bring home a new bird (birds is strongly recommended), you must quarentine them for at least a month. They need to be as far away from your exhisting flock as possible to prevent diseases from spreading. Even if the birds look healthy when you get them, they may have an underlying illness that dose not make itself known until it is too late.
I am really glad I quarentined my birds! When I brought my two EEs home, they looked completely healthy. And they were. It was my exhisting flock that got sick! My two BRs got a bad case of round worms that I had to spend a good amount of money to treat. I am glad that I only had to treat the two affected birds. If they had been added all together, I would have had to treat all four. Lucky for me, my new birds were still illness-free after a month and it was safe to add them to the flock. One little bug from a new bird can take out your entire flock very quickly. Introductions are hard because you must disturb the "pecking order" in order to do it. Usually there is alot of squabbling (no blood, mabey some feather plucking), but they settle down in a couple of days.
Hopes the answers your question!