It seems like it’d be nearly impossible for an orca to manage to eat a bird. One lives in the water while the other mostly sticks to the sky. An orca named Kalia not only manages to eat a bird while in a tank, she manages to almost coax the bird into coming right up to her before she attacks. Those other birds might want to remember this trick the next time they run into a seemingly ‘friendly’ orca.
https://www.youtube.com/watch?v=20LYKnFryns