Cockatiels are wild birds so if they were never tamed when they were young, they will still be untame.
It is easier to tame a young cockatiel, however with the right attitude, you can tame an adult cockatiel.
You have to start with trust. Taming a cockatiel take a while and one wrong move could ruin all your work. Start with standing next to the cage and talking to your bird. Do this for about a week so your cockatiel gets to know your voice and is calmer around you.
Then you could try putting a fresh vegetable (in your hand) next to the cockatiel and hold it there. Don't force the cockatiel to get closer to your hand - this will scare him/her. You need to earn trust.
Eventually, your cockatiel will be comfortable with you having your hand near him/her. If you cockatiel is comfortable to actually eat from your hand, you can try picking it up.
Do not grab our cockatiel on its back, try to persuade him/her to sit on your finger. Do not force your cockatiel to get onto your hand. This will ruin the trust. Eventually your cockatiel will be ready to sit on your finger and eventually your shoulder! It's all about trust and if you're cockatiel trusts you, it would love to sit on your shoulder!
it may be to do with how they have been raised but also how you have been treating it.
You can pick up a cockatiel whether it is hand tame or not. This does influence how you pick it up, though. If your cockatiel is hand tame, you just put it on your finger, your arm, your shoulder, etc. and it just sits there happily. When it is not hand tame, you have to pick the cockatiel up by its back with your index finger and middle finger around its head. On the internet, look up ways to hold an untame cockatiel and find a diagram so that you pick your cockatiel up correctly if it is untame.
Monkeys are not typically very tame. They are often very wild and this is why they attack people at times when they feel threatened.
Some hamster may come home very nice and tame. But some you have to tame them youself.
Very carefully.
They tend to be tame. Having had two of them, one was very submissive and the other was more rambunctious -- for a golden. They are smart, love to play, great for families, full of fun and loyal.
The cockatiel can be a very talk'a'tive bird, but it may take you a lot of time to train them. But if you don't give up cockatiels can be taught to say almost anything.
tame them?! if you are have problems with a mean cockatiel, then I suggest you start bonding. You can play with them and teach them songs. but as for taming.... well if it bites, never flinch away or cry out in pain. When I got my first cockatiel it bit me so many times that if i just rubbed against a wall my hand would bleed. But eventually may cockatiel stopped. It will get used to you. As for sitting on your hand, well that is usually automatic, but it will loosen up and start to walk all around your body and play with your hair, and so on. To keep them from flying away is a trick. You have to keep them entertained enough that they won't leave. Eventually they will learn, interacting with humans is not inate for birds.
Yes, it is possible but very hard!
Cockatiel bird is a household bird and very easy to breed. One of their behavior is when a Cockatiel bird is hissing it means the bird feels frightened or threatened.
Cockatiel's are very difficult to age. You can only be accurate about their age if you've had the bird from a baby. The only way a cockatiel can be aged is as a juvenile, adult or senior.
Really tame - like some parrots can be - no, or at least very rarely. They might sit nervously on your finger, but seldom would one be truly tame.
Just guessing here. There are bad birds sometimes, just bad wiring. The odd of you getting two of them, slim. Birds tend to get aggressive for a reason. Very often from not being handled enough. Are you treating the new one the same way you did the old one? They have to be handled properly for them to trust you. Are their wings clipped? That tends to subdue most birds.