bmsweb wrote:Pola, good luck with the fetch. I've almost got my bird to do this. If the ball is too far away he wont get it

You have to set your bird up for success. When teaching a trick, the bird should get a treat most of the time. There are tricks (like fetch) that need to be taught in progressive steps. When I taught my former budgie to fetch he wasn't interested in touching any object (if it wasn't millet, he didn't care). I had to teach him first that if he even touched the object, he'd get a treat just for that. I had to put the object into his beak and give him a treat for that, and then after a while, he figured it and he would go to touch it himself. Eventually, he would sort of inadvertently pick it up (like flick it with his beak). Then I had to reward for that to encourage him to pick it up. Then I put a small bowl or my hand under where he would immediately drop it, and rewarded him for inadvertently dropping it in my hand, and on and on.
I'll give you another example. I taught my former budgie to wave. Let's say while I was teaching him, 3 out of 5 times, he lifted his foot moderately high and I gave him a treat for each time. 1 out of 5 times, he lifted his foot very high, and I gave him a special treat and lots of praise. 1 out of 5 times, he barely lifted his foot and I didn't reward.
When you are teaching a trick like this one, you have to reward the bird for the step you are working on and you should be rewarding most of the time. If your bird is not getting it, you are either progressing too fast, your bird isn't motivated anymore in that training session, or you are doing something else wrong. I think you should be rewarding while teaching a trick 4 out of 5 tries, and 1 try should be a little more difficult, progressively a little bit harder and little bit more towards the direction of the next step of the trick.
If your bird won't go to get the ball if it's far away, make it easier for now and then at a more gradual pace, make it a longer distance. Train this trick at the very beginning of the session when the bird is most motivated.