That's an interesting question. I have a lot of surrenders because of new babies, not babies so much but young toddlers.
We just recently had a TAG come in for giving the baby a really nasty bite through the cage bars. I have a young autistic son- who due to his lack of pain recognition (he doesn't care or notice nips, burns etc- and learn from the experience like normal) we've had to work hard at learning how to keep him and birds safe.
There are ways, bird rooms, plexiglass, child fencing, hanging playstands, etc to make it work, or at least help greatly.
I think some people just don't want to try, there are those that try and don't feel it's working well enough, and there are those that just don't have the space or means to keep "trying" to make it work. With a new baby or young toddler some people don't feel like they have the weeks or months to train and experiment with a really child aggressive bird- they feel the risk is to great....
It breaks my heart sometimes when you have people who have really tried and still haven't found a way to make it work....some birds can be highly aggressive towards little ones and in the end I do understand that no matter how much someone loves their bird- a human baby/toddler/child has to come first.
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