Learn how to say Cacatuidae correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word cockatiel:
a slender long-crested Australian parrot related to the cockatoos, with a mainly grey body, white shoulders, and a yellow and orange face.
Nymphicus hollandicus, family Cacatuidae (or Psittacidae)
late 19th century: from Dutch kaketielje, probably a diminutive of kaketoe ‘cockatoo’