Linked from
The 13 pages that link to Cranial kinesis, each with the reason it gives.
BeakRelated: In many birds, skull mobility lets the upper beak move during feeding.
JawRelated: It shows that jaw action can involve motion beyond a single lower-jaw hinge.
CraniumCompared with: It contrasts with the largely immobile joints of the adult human cranium.
BillRelated: In many birds, skull-joint movement helps the bill open and handle food.
GruidaeRelated: Cranes use a kinetic skull when probing and handling food.