* Size: Cockatoos are typically larger than cockatiels, with some species reaching up to 2 feet in length. Cockatiels, on the other hand, are typically around 1 foot long.
* Appearance: Cockatoos have a distinctive crest of feathers on their heads, which they can raise and lower. Cockatiels also have a crest, but it is smaller and less pronounced. Cockatoos also have longer, more pointed tails than cockatiels.
* Temperament: Cockatoos are generally more outgoing and social than cockatiels. They are also more likely to be noisy and destructive. Cockatiels are typically more shy and reserved, but they can also be very affectionate.
* Lifespan: Cockatoos typically live for 20-30 years, while cockatiels typically live for 15-20 years.
Overall, cockatoos and cockatiels are both beautiful and intelligent birds, but they have different personalities and needs. If you are considering getting a pet bird, it is important to research both species carefully to make sure that you are choosing the right bird for your lifestyle.