I have adopted a 4year old Quaker parrot from a family who stopped getting him out due to there sons illness. He will come out the cage on his own land on your head/ shoulder or near you and will also sit next to you whilst sat on floor however if you put your hand near him and say step up he will try to bite you. Whilst on your shoulder he will snuggle into your face and give kisses , to get him off we either ring his bell in his cage and he will fly back or we walk to his cage and lower our shoulder near his door and he will step off, what's the best way to stop the biting ? And allow us to use our hand /arm to touch him. He is also more aggressive in and on his cage, we can clean it out fine it's just when near him he will try to bite even when we offer a treat he will take it but try to bite you after or during the treat so have to be careful were we keep our fingers. He has only ever bitten when we put hands near him. Any advice is truely grateful . Thanks