In a mixed aviary, territorial behaviour is rarely about a bad-tempered species. It is about geometry. One feeder that can be guarded, one highest perch, one sheltered corner with a box: each is a prize worth defending, and the bird who wins it will spend the day policing it while others go hungry or stressed at the margins. Change the geometry and most of the behaviour changes with it.
Map where the disputes actually happen
Spend two or three sessions simply watching, at the times trouble usually starts: first feeding, midday bathing and the evening settle. Note which locations produce chases, which birds are always displaced, and which individuals never quite reach food. Owners are often surprised to find the conflict is not flock-wide but centred on one junction, such as a single swing hung in the only flight path, or one ground-feeding species being harassed where it must eat. A written map of hotspots turns a vague sense of tension into specific furniture decisions, and it tells you afterwards whether those decisions worked.
Make every resource impossible to monopolise
Provide at least two more feeding stations than the number of distinct groups in the aviary, placed out of each other's line of sight where the structure allows, because a bird cannot guard what it cannot see. Do the same with water and bathing dishes, and add perches across several heights and zones so a displaced bird has somewhere legitimate to go rather than the floor or a corner. Planting, screens and hung branches are not decoration in a mixed aviary; they are sight breaks that let lower-ranking birds break eye contact and end a confrontation without flying the length of the enclosure. Feed at ground level in more than one spot if ground feeders are in the mix.
Handle nests, corners and chronic bullies directly
Breeding accommodation is the strongest territorial trigger of all. If you are not intentionally breeding, remove nest boxes and enclosed shelters that invite ownership. If you are breeding, provide more boxes than pairs and accept that those occupants need extra space and monitoring. For a genuinely relentless bully, layout changes come first, but a bird who injures others or starves a particular victim out must be moved to different accommodation; a mixed aviary only works when every member can eat, bathe and roost in peace. Likewise, a repeatedly targeted bird should be checked for illness, because flocks often single out a weakened member before people notice anything wrong.
Review the balance every season
A mix that works in winter can strain in breeding season, and young birds maturing into adults rewrite the hierarchy without asking permission. Re-walk the aviary at each season change with the same questions: can every bird reach food unchallenged, is any bird living on the floor or in one corner, are roosting spots contested at dusk. Photographing the layout and logging incidents for a fortnight gives you evidence instead of impressions when you adjust stocking or furniture. Managed this way, territorial flare-ups become maintenance signals rather than emergencies, and that maintenance holds up because KinsLe's Care Teams keeps the aviary rota visible, with completed rounds logged instead of assumed.