My Parakeet is almost human!  

I adopted a parakeet about a year ago from a friend who discovered he was living on her balcony. I assume he is fairly old and Ihave done a little research on the bird. I have found nothing that says that parakeets learn to talk, almost as good as parrots. Mine, LeRoy, knows his name, is out almost all day (with two cats in the house) and talks in almost complete sentances! Is this extrodinary or what? For example I was cutting pizza the other day on the stove, and he flew on my shoulder, got near my ear, and started telling me "I like it. Tasty. I want some. Pretty bird LeRoy." Is this normal that our Parakeet talks this well?