Birds squabble, just like humans.  They get on each others nerves and will warn each other, in no uncertain terms, to back off! Even my cockatiels, who cannot bear to be apart from one another, get into it from time to time.  Sometimes a disagreement might escalate to raised wings and flared tails, but it is always peacefully resolved. There are times, however, when a war is waged that is unprecedented and, from our point of view, unprovoked:

A friend has, among many other species of parrots in her home, two amazons: a female aged 45, and a male aged ...

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