We have an umbrella cockatoo. And a Sunday conure. I'll tell you if they have the proper interaction and affection everyday they are great companions. This is why they will normally bond with one maybe two if you're lucky.
Our conure is our alarm, warning, and door bell. He will alarm is anything moves outside, this is his warning to the rest of the flock. Also he has another which is telling our dogs that someone is at the door and they know every time the difference in his calls.
Our cockatoo has been with my wife now for 20 years and she rescued the bird form a diet of potatoes chips and soda to a healthy one. Lol. She will scream and push her vent out if she is alone, only when more than one person is home. If my wife or I are alone at home she does not scream, who knows why.
Birds can be great companions just be careful what they hear, parrots so repeat,

. There are CDs you can get and ply them when your not home to help your parrot to build their vocabulary. Their vocabulary will also build on curse words also. Lol.
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