S ometimes Lupin gets a spark in his eye that suggests there might be a hint of a clue hiding in his noggin. If I don't disturb him, he'll end up preening and going to sleep on my shoulder. He preens when bored, when I ruffle his feathers, when he gets wet, and when he's about to go to bed. After preening he'll fluff up and lift up one leg. He grumbles if I jostle him too much when I turn the page of my book.
Wood is great, but cardboard is a good second.
He also has a fondness for gum wrappers, especially Trident Freshmint. He'll sit there and chew until it's just a little paper ball, and he makes quiet contented chirps as he chews. As for shreading furniture and wall paper, he's worse than a cat. He constantly chatters, relaying all the cool things he finds to me. Makes me wish I could fluently speak cockatiel.