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Why are my cats all of a sudden being so territorial?

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I have 4 cats and 3 of them have been fighting like CRAZY lately. They have been around each other for over 5 years now and all of a sudden they have been attacking each other almost daily. And I'm not talking about a little hiss and a swat, they are full out attacking each other. What is all of a sudden causing this? Nothing has changed in the household.

(the ones fighting are 2 females and 1 male - the one starting it all is a female and shes not the oldest)