Different species

Question
I have a male green singer and a male zebra finch that are in the same cage. They don't fight but tend to keep to them selves. My question is can I introduce a male gouldian? Will the gouldian do ok without another gouldian? And or will he be comparable with the other two? Thank you for your help. Have a great day.

Answer
I don't see a problem with introducing a male gouldian to your group but I would keep an eye on the cage while everyone gets used to eachother. The birds you have all are technically "avairy birds" but zebras have been known to be slightly aggressive.

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