A parrot's beak is made of keratin, just like human fingernails. The mandibles are hinged to a parrot's skull which gives the upper and lower mandible separate vertical movement. Their beaks grow continuously so parrots need constant sources for chewing to help wear down their beaks and keep them in good condition. Parrots can produce a lot of pressure when pressing the upper and lower mandible together. Cracking nuts is as easy as pie.
Birds communicate using vocal skills and body language.
Beaks are used to explore their surroundings and environment. Some parrot species use their beaks as a third foot to grasp, to climb, to step up, and to hold nuts or toys. Biting is one of the behavioral problems bird owners fear the most. Anyone who has ever been bitten by a large parrot can certainly understand the fear of being bitten. One of the most common reasons birds bite is out of fear.