In Reply to: GCC and a cockatiels posted by David on March 04, 2012 at 20:14:16:
It's going to completely depend on the birds. In general you can't even count on being able to safely put two birds of the same species in together. You'd be better off assuming you'll need separate cages ad counting it as a bonus if they can live together. GCC and 'tiels are about the same size, but GCC have much stronger beaks.
The other consideration is that if they DO get along famously, they may not be nearly as interested in you anymore.
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