A shared shape rule, the power cascade, governs most bird beak growth. It links modern birds with extinct dinosaurs.

"One of the most common parts of the skeleton that birds use for aggressive displays is the rostrum, the beak. Having a weaponized beak makes sense, because it moves the weapon further away from ...

The Bigg's killer whale skull is more robust and has a wider rostrum (beak), which are presumably adaptations for feeding on larger prey such as marine mammals.