Snake Skull Occipital Condyle Count

The question asks about the number of occipital condyles found in the skull of a snake. Occipital condyles are bony knobs located on the back of the skull that articulate (connect) with the first vertebra of the neck, called the atlas. This articulation allows for movement of the head.

The number of occipital condyles varies among different groups of vertebrates:

• Mammals typically have two occipital condyles (dicondylic skull).
• Birds typically have one occipital condyle (monocondylic skull).
• Reptiles (including snakes, lizards, turtles, crocodiles) typically have one occipital condyle (monocondylic skull).
• Amphibians typically have two occipital condyles.

Snakes are reptiles. Therefore, their skulls are generally monocondylic, meaning they possess only one occipital condyle.

Based on the typical structure of a snake's skull, the correct number of occipital condyles is one.