Sun conure biting

[Cockatielsongs]

Okay lets get this out of the way, never ever let a biting bird sit on your shoulder, even with tame birds its usually not recommended. With that aside I would train them one by one, get one in a small room preferably empty so there are no distractions, on a T stand or back of a chair. Begin clicker training first, simply click the clicker and reward, that way the bird will know that when he hears the clicker a treat comes. Keep each session short at 5 minutes max as their attention span is very short. Clicker train them all before you move on to target train. Keep them away from your body, including arms. At this point just use your hands to reward or move them to different places.