Claire does have two of the same species,
Kazoo and Hoosier. She said they are friends and seem to benefit from having each other. Her cockatoo Sophie is kept separately.
Her thoughts on the topic;
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I think I could flip flop back and forth on this all day long.
I agree that they should have companionship from their own kind... but I also know how difficult that can be to acheive. Some birds reject friends, and want to be alone, or worse they will attack or even kill other birds introduced. And if everyone brings home a buddy for their bigger birds today, imagine how many birds will end up in shelters after the friendship didn't spark and the owners can't deal with birds fighting, attacking, or self mutilating because of the stress.
In an ideal world, all birds would have a bird buddy of same or similar species.... but the reality is the world isn't perfect.
This is coming from someone who ended up with 6 birds looking for a buddy for their single bird
luckily for me and my birds, I have smaller birds and could keep all of the birds where the relationship with my first bird didn't work out.
There is always the case of a bird getting stressed by a newcomer and selfmutilating. The owner may sadly be forced to relinquish one bird to a shelter to benefit the birds.