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well it helps them break up the f00d
Pointy beak
parrot
A parrot has a strong curved beak, specifically designed for cracking hard nuts and seeds.
smaller and longer and thiner and pointer beak
The beak can allow crushing of seeds and digging into the ground or vegetation for food
they have a curved or a hook shaped beak they use it for cracking nuts ,seeds and also for climbing
A beak that can dig into thick trees.
Cardinal
A sparrow has a multipurpose short hard and round beak. This is used for eating, digging insects, and cracking seeds
The beak of a Loerie is small and curved like a traditional parrot beak. The beak is great for manipulating fruit and seeds to remove husk or rinds, yet still powerful enough to crack nuts.
I would guess that a small long beak would work best.