the wide range of movement in a parrots upper mandible. typically, a birds upper beak isn’t movable and is fused to the cranium through bone and/or muscle. in parrots, the various bones that make up the upper palette and mandible have adapted to allow the beak to move alongside the lower jaw opening, as an adaption for manipulating objects and eating tougher foods.
this bird is a blue-crowned parakeet, who used to be a pet. their skeleton will be articulated for scientific and educational purposes.