Hi all, we have just acquired an Aviary and would like to know what birds can co-exist happily together.
We have 2 Cockatiels and 2 Quail at this stage.
Thanks
Colin

Where are you from? Melbourne

If you are breeding the birds it will be hard to put many different species together because of territorial fighting.
If you just have the birds to look at with no nests, more varieties can be kept peacefully together.
Also different types of birds carry different types of bacteria. Bacteria that does no harm to one species might make another species sick or die.
Here are Three articles about "mixed aviaries".
http://www.birdkeepinginaustralia.com/articles/articles2.html
http://www.cockatielsociety.org.au/articles/aviary_and_cage.htm
http://www.finchsociety.org/cfa/mix/mix.htm