Literature
Orcas VS. African Grey Parrots
A side-by-side comparison.
Many people, especially after the film "Blackfish" was released, are opposed to cetacean captivty. They say that these animals are too intelligent to be in captivity, and they point to things like drilled teeth, boredom, and longevity, which they believe proves that these animals are not good candidates for life in captivity. What many, in fact most, do not realise is that this move could potentially be used to cripple the entire zoo industry. In fact, it could also be very realisticly used to take away a long-beloved pet; the parrot.
Parrots have been in captivity for quite a while, but they are not domesticated.