James,
Do a search for breeders of Harlequin or Catalina Macaws, there you'll find the flip side.
Jeanette,
Yes and no. He does state that their behavior is dissimilar, and that the mating can produce quirky birds. But in my experience, I've yet to meet a parrot that wasn't a bit quirky. I have a home full of quirky!
Lump