One of the most difficult things to call when you have birds in a pen is whether they are huddled up because they are cold, because they have had a wet night and are waiting for the sun to warm them up and dry them off, or because there is actually something wrong with them. And while the temptation might be to leave them untreated, assuming that they will pick up when the weather improves, the difference between losing only one or two birds and having the whole pen go down with something always hinges on an early diagnosis and the correct treatment.
