Why does my budgie grind his beak?

Parakeet Behavior and Sounds: Budgie & Parakeet Information

Bird Body Language 101

Parakeet sounds What do they mean? - Parrot Essentials

ハクサイーヌ（固定）@レタスの飼い主 (@1214_ami) / X

鸟鸟蹦迪来瓶黑桃A!_哔哩哔哩_bilibili

☑ SPECIFICATION - Size : 4.8 x 1.6. Package includes : 6 x Bird Grinding Beak Calcium Stone.(Random Delivery Of Color) ☑ A GOOD TOY FOR GRINDING

Bird Grinding Beak Calcium Stone With Bell,Rat Mineral Lava Block Trimming Teeth Chewing Toys for Chinchilla Bunny Budgie Cockatiel Parakeet Parrot

How to Train Your Bird to Allow Petting

How to Train Your Bird to Allow Petting

鸟鸟蹦迪来瓶黑桃A!_哔哩哔哩_bilibili

Is this beak grinding or should I be worried? : r/budgies