**Spaces in skull bones which connect to airways in the head rather than the air sacs
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*Large orbits
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*Skull plates are separated by spongy bone
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*A single occipital condyle articulates with the atlas allowing more rotation of the head
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*In parrots, the nasal bone and frontal bone are joined by a flexible cartliage structure allowing greater jaw opening which is called the craniofacial hinge. This allows kinesis to occur.