When I had my two budgies, I had a slight problem with jealousy. I would have to give M&M his meds, and after he would get millet for being such a good boy. Cutie would get jealous,and would fly out to get some too! Considering the fact that she would never come out, no matter how long the cage door was open, I was amazed! She never really had a behavior problem because of it... but M&M passed away shortly after, so she wasn't jealous for long 