When I was younger, we had two pet cockateils - Sophie and Georgette. Sophie died in an easy-to-forget manner, but the more exciting/god awful death happened to Georgette. He got into a tousle with a pet ferret. Then, lost an eye, which also made half his head bald. A lot of his joie de vivre left with that eyeball.
Cockateils are a bit wimpy, really. They can grow very ill upon drafty conditions. This is, I presume, why there are videos of cockateils riding on tortoises, but not of cockateils riding hares.