So I've noticed my little Cosmo chewing EVERYTHING. My hair, my headphones, my computer, paper, wood, (attempting to) metal, and my rubber watch. Is this normal? He also bites my cuticles and tugs which hurts a bit. I dont think he's angry because he always wants attention.
He has some homemade paper shredding toys in his cage. He rips them to pieces. (I checked to make sure all materials are safe, don't worry )
That is a natural behaviour not just pertaining to budgies, but also to other species of pet birds.
Some budgies are more into chewing than others and it's our job to provide them with safe materials for them to keep their beaks busy.
Your Cosmo would greatly benefit from having at least a couple of wooden chew toys (if he doesn't already have them).