To get the background on this: http://www.mytoos.com/forum/ubbthreads.php?ubb=showflat&Number=236632#Post236632
Jacko is a DNA-sexed female TAG of about 10 years of age. She is fully flighted and has lived with me for 5 or so years.
I try very hard to use ABA principles and only positive reinforcement and as such have been blessed with a bird who rarely bites and loves scritches, usually she only bites when off in hormonal destruction mode and I dare to try and remove her from her latest nesting project or etc.
However, she is *extremely* jealous and aggressive towards my male cockatiel (she also is this way with most animals and small children). When he is removed from his cage she will vocalize, and charge inside her cage or angrily bash toys etc. If it is very bad she will bite cage bars and start spreading her wings so that if it wasn't for the cage she would fly over and attack him. When she is out of the cage she sometimes will fly over to his cage to terrorize him, particularly if I am doing some training with her or giving her attention and turn my back on her for a minute.
The end result I would like to achieve is for them both to be out at the same time on separate areas under close supervision.
I'm unsure though if this behaviour can be worked on as its instinctual for a bird to choose a mate and defend territory.