I Found this on the internet and explains quite a bit:
Eclectus Parrots are one of the few species parrot that go through a short hormonal stage. For majority of this species can be short & tolerable. But there are some that become very aggressive & intolerable. The female, when coming into adulthood can sometimes become moody & over protective of her surroundings. The males can become stubborn during these times & both can be dealt with by using positive reinforcement, though there are some Eclectus that just want or need to breed.
Both male & female can display territorial behaviours during this stage at any of their favourite place in the home. You cannot stop hormonal behaviour, but you can lessen the severity of it. Hormonal aggression is a natural part of life for parrots & occurs through maturity & breeding times. In the wild if an Eclectus has found the perfect hollow tree & a good supply of food & water close by she will naturally want to protect this area & this is where the aggression plays a roll. A pet Eclectus is no different. You have supplied them with a cage, toys & endless supply of food & water, so when breeding times comes around why wouldn’t they want to protect their space from unwanted intruders?
This sort of aggression can be eased or sometimes even prevented by taking a few simple measures. Spreading their toys, food & water throughout the house, rather than having it all in one small space. By setting up more than one place for your ekkie with food, water, toys, swings & stands throughout the house & having your ekkie active equally in these spots you’re giving your parrot less opportunity for the need to protect the one 'perfect' spot. You can also block off small dark areas & corners if you see your ekkie is starting to favour them & spend a great deal of time in these areas.
My Eclectus will favour being under our coffee table during hormonal periods. If we allow this for a long enough period he would start lunging at our feet if we got too close. He would also drag all his favourite toys under there. His aggression was very mild, he wouldn’t go further than lunging & growling but it can start to become quite frequent. To prevent things going any further & getting out of hand we wrapped a t-towel around the bar under the coffee table where he liked to sit with his worldly possessions. With the t-towel in place he was unable to sit there so he stopped going under the coffee table & his would aggression stop.
When Eclectus parrots reach maturity they can sometimes lash out for no apparent reason & it happens in both sexes. If the aggression is hormonal or maturity they not usually aware of their own actions. Hormones can cause undesirable behaviours & there is very little we can do about this except ride it out & try & have some understanding of this & not attempt to discipline a bird for their behaviours through these time. This will eventually ease & go. If you attempt to discipline this sort of behaviour your parrot will not understand why it’s being disciplined & you may make things much worse. You can’t force your parrot to stop being hormonal. It’s a natural course of life.
At the age of approx. 1 year old, Eclectus start to 'play roll' in nesting even though they're not yet mature. Between the age of 1.5 years & 4 years the Eclectus will mature. The age can differ individually as well as in sub species. The average noted maturing age is 3 years old.
I always thought they growled when angry, but I would have thought if that was the case then
