Put the parrots stand on a tree and begin the exercise

Nod yes

Hold their treat/reward in your fingers then move it up and down to get their attention so that they will follow your fingers , their head will move up and down . If they do it right , you need to say ” nod ” immediately  .Continue to repeat that action, your bird will follow and step by step , they will understand the situation . A number of birds will have nice shape when they do a bow and if such training is very good by taking your finger gently pressed their body during training exercises to adjust better shape.

Teach parrots to nod and shake their heads

shake head no

Option 1 : The most slowest and simplest way . Hold their treat/reward in your fingers then move it from right to left to get their attention so that they will follow your fingers and shake their head , at the same time say the order  “shake ”and give them bonus . Continue to repeat that action until they do correctly what you want . This method requires patience and a long-time practice.

Option 2 : Say  “Shake” and blow across their nose or their feathers. Most of the birds will naturally respond and shake their head –>Clicking “click” –>give them bonus  .Continue to repeat that action until your bird understand the situation and do when you order .