Hi,
They of course are compatible IF they like each other, otherwise there wouldn’t be more cockatiels. LOL As for adding a bird, if your bird is a pet, then getting another bird is not a good idea. Generally when birds are caged together, they end up bonding and no longer want to be handled. They have each other and don’t need people for companions. So if this is a bird that you handle, I would not get another bird. If this bird is alone in a cage all the time and is wild, then a companion is something to consider. However, male or female, there is no guarantee the birds will get along. If you have no interest in breeding, then you should not get a female. Two males will usually get along, but they may not. You would need to keep the birds in separate cages to begin with. The cages should be side by side and you watch for signs that they are interested in each other, such as sitting close to each other. Once you do introduce them to the same cage, you need to watch them carefully to be sure they don’t fight. And you need food and water dishes for both birds, at different places in the cage so one bird doesn’t keep the other from eating. You also need birds that are around the same cage – do not put a young bird with an older bird.
Thank you for asking Lafeber,
Brenda