[Ol' Dan Tucker]

It was my experience that many of your sick birds, would have improved with a better diet and vitamins.

Parrots have diseases, as we do, cancer is common.

Maybe. Maybe not. The rescue boards are flush with stories of birds who are loved and well-taken care of, yet start plucking and self-mutilating.

They all can't be diet or disease-related.

To play devil's advocate, why is Petco selling pets that are prone to cancer?

[Ciexyz]

You're sure doing your best to put forward a worst case scenario for avian ownership, aren't you.