Join Date: Sep 2012
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How old is Felix and what type of bird is he?
Babies tend to be vocal when they can't be near "mommy". I know my boy Phoenix will scream when I leave the room (doesn't matter if he's in or out of the cage) and then when I come back where he can see me he stops immediately.
Clicker training is a very good thing to do, it could take some time to train him to stop though. You also have to realize that (if he's a Macaw) they are known for screaming so you might have to put up with some. It's a good thing to train him that he's not going to be out all the time when your home. Just make sure you continue to give him enough "free time" or he will get bored and start screaming/destroying even more.