The vertebrae of birds are characteristically

Heterocoelous

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Acoelous

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Opisthocoelous

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Amphicoelous

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Solution

The correct option is A Heterocoelous
The vertebrae with saddle-shaped articular surfaces are called as heterocoelous. Birds show this type of configuration because it permits extensive lateral and vertical flexion motion without stretching the nerve cord too extensively or wringing it about its long axis.
So, the correct answer is 'Heterocoelous'.

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