X2I've read differing things... the best conclusion I have been able to come to is that is it PROBABLY genetic so not to breed crossbeaks.
X2! Sorry.
Cross beak isn't just the beak it is a skull deformity, the earlier it shows the more severe it will become. If you keep a cross beaked bird you will need to have a deep dish for food they can scoop w/ instead of pecking for food. You also may need to trim the beak periodically depending on how bad it is.
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