Birds vertebrae are

Acoelus

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Amphicoelous

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Heterocoeolus

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Procoelus

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Solution

The correct option is C Heterocoeolus
Vertebrae with saddle-shaped articular surfaces are called as "heterocoelous". This allows vertebrae to flex vertically and horizontally while preventing twisting motions. These vertebrae are found in the necks of birds which allows the head to move at an angle of 180 degrees. Hence, option C is correct.

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