I brought a budgie, Bib, to the vet a few years ago for an exam. Bib was a tiny girl with the face of an angel but she would bite the web of skin between the thumb and the first finger so hard and refuse to let go as she tried to pierce the victim. I warned the vet as he carried her in her travel cage to the exam room, and he laughed and said "I'm not afraid of a budgie bite". That was until he returned with her. She bit both him and his assistant very hard. I swear I saw a smile on her angelic face!