A pediatric nutritionist is a registered dietitian (R.D.) that has specialized in nutrition for children, so you must first become a registered dietitian. You could enroll in a bachelor's degree program accredited by the Commission on Accreditation for Dietetics Education.
Here is part 1 of Cockatiel Types and Descriptions which covers 5 types of cockatiel types including whiteface, lutino, albino, normal greys, and pied. Each ... Here is part 1 of Cockatiel Types and Descriptions which covers 5 types of cockatiel types including whiteface, lutino, albino, normal greys, and pied. Each slide gives a bried description of what each type looks like, and includes a photo. Please watch part 2 for more types. Thanks for watching. :) I own none of the photos shown in the following video.
Cockatiels can eat: 1  Lettuce - cockatiels absolutely love lettuce! (in moderation - lettuce in large amounts acts as a laxative) 2  Carrot. 3  Brocolli. 4  Cucumber. 5  Corn.  Parsley (in very small amounts, occasionally - it is dangerous in large amounts, or when consumed frequently)