http://en.wikipedia.org/wiki/Vertebral_column
Regional vertebrae
Vertebrae are defined by the regions of the vertebral column that they occur in. Cervical vertebrae are those in the neck area. With the exception of the two slothgenera (Choloepus and Bradypus) and the manatee genus, (Trichechus),all mammals have seven cervical vertebrae. In other vertebrates, the number of cervical vertebrae can range from a single vertebra in amphibians, to as many as 25 in swans or 76 in the extinct plesiosaur Elasmosaurus.
Regional vertebrae
Vertebrae are defined by the regions of the vertebral column that they occur in. Cervical vertebrae are those in the neck area. With the exception of the two slothgenera (Choloepus and Bradypus) and the manatee genus, (Trichechus),all mammals have seven cervical vertebrae. In other vertebrates, the number of cervical vertebrae can range from a single vertebra in amphibians, to as many as 25 in swans or 76 in the extinct plesiosaur Elasmosaurus.
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