Please can anyone tell me if there is any truth in something that I read recently that two male canaries together wil fight but if there are three males they won't fight.

It's not a cast iron fact,but it can work.If I put pairs of finches in a flight to breed I will put three pairs in.They are usually too busy watching their nests to bully each other.Two pairs are more likely to fall out.

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I have an aviary with 40 canaries most get along fine even in the breeding season but I have got a couple of males that would fight to the death and in the breeding season they are very aggressive,so don't know there is really a cast iron answer

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Thanks, I guess it's just trial and error.