Cockatiels are parrots and, like all parrots, they have two main means of escaping predators:
Jaguars are apex predators and have no predators themselves.
They fly.
If by this you mean why do cockatiels have crests then its because it frightens predators, larger birds and if it dislikes a person it may raise it to frighten him/her Cockatiels are small members of the cockatoo family. All cockatoos have crests. These birds may raise their crests when they are startled, or flatten them when they are angry.
Yes, cockatiels can get parasites.
Wolves are predators
The predators of a termite are birds, ants, lizards, and dragonflies.
Cockatiels are a type of cockatoo.
They hide in their shell.
they kill themselves by drowning them
pronghorn antelope survive by its speed and keen eyesight to get away from their predators
A cheetah uses it's great speed to run away quickly from its predators.
The majority of predators are scared off by the rattle - it's not a 'natural' sound and most animals will flee from something they're unfamiliar with. Add to that - a highly-potent venomous bite - and the rattlesnake will survive most predators.