Why do Blue-Fronted Amazon Parrots have black beaks?

Question

http://www.dkimages.com/discover/previews/892/20464202.JPG

Also their toung is black. I have a parrot like this and I was wonering why?

And other parrots such as The Double Yellow Headed Parrots have a Cream colored beak:

http://parrotadoptontario.com/birds/amazon.jpg

Answer 1

why not it just the breed. its like people have diffrent color eyes it just your jeans

Answer 2

That's just the way it is. Some dogs have stand up ears and some have floppy ears.  I have a Goffins Cockatoo his beak is a creamy grey colored. My Cockatoo has a black tongue also. That is the coloring of that species of bird.

Answer 3

That's just the way they are. I've got three caiques -- two black-headed caiques and one white-bellied caique. The two black-headed caiques have black beaks. The white-bellied has a horn-colored beak. That's the way they are. Some birds have ORANGE beaks (eclectus, to name just one).