what species of parrot or cockatoo would best go with a cockatiel? but the species is to be kept in WA?
i am doing this for a tafe project and am not sure of which birds are compatible with cockatiels, please if anyone could help
um i do know about cockatiels. im a breeder. but i dont own any larger species of birds so that is all i want to know is help with what species can go with them. and for it to be alowed in WA.
The best species to go with cockatiels are other cockatiels. 
But yes, they can be kept with other species. In order to do this, they should be housed in a good sized aviary so that they birds don't need to be anywhere near each other if they don't want to be. They should also have plenty of feeding stations.
Moniter the birds carefully, be aware of their individual personalities. Most are fine, but bullies do exist.
With that in mind, the following parrots can often be kept with cockatiels:
Bourke Parrot
Budgerigar (note, can be aggressive)
Turquoisine Parrot
Scarlet-chested/Splendid Parrot
Regent Parrot
Princess Parrot
Elegant Parrot
Plum-headed Parrot
Red rump parrot
Blue-wing grass parrot
Superb Parrot
The following -shouldn't- be kept with cockatiels:
Rosella
Ringneck
Lorikeet (very aggressive species, plus different diet requirements)
King Parrot
Derbyan Parrot
Pacific Parrotlet
Hooded Parrot
Golden-shouldered Parrot
Mid-Large sized Conures
Any medium and large parrots (including cockatoos)
As for lovebirds, it can be done, but you would need to monitor them closely and give them heaps of room - lovebirds can be very aggressive. It's strongly not reccomended.
And as for non-parrot species:
FINCHES: This is a controversal topic. Personally, I have kept finches (including canaries) with cockatiels for years and have never had a whisper of a problem. That's because I've followed what I wrote at the start of this answer.
QUAILS: Chinese Painted Quails can be kept with cockatiels in aviaries.
DOVES: I've kept Ringneck Doves with cockatiels for years with absolutely no problems. Diamond doves, Masked doves, fruit doves and crested pigeons are also okay. Spinifex, Partridge, Peaceful and Bar-shouldered, homing pigeons are not. Quarantine doves and pigeons well before mixing with parrots.
I hope that helps. 
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