One of my hens has a crooked beak. She is a mixed hen and she is 6 months old. We noticed her crooked beak after 3 months and named her "Catawampus" She interacts with the rest of the flock fine and eats and drinks like the rest. The upper beak continues to grow as she gets older and is starting to curve back towards her neck. I don't know if the beak can be filed down to keep it from getting longer.