A tetrapod is defined as an animal with

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A tetrapod is defined as an animal with four limbs, which distinguishes them from animals such as fish, which have fins instead of true limbs. While many tetrapods do have a four chambered heart (like mammals and birds), this is not a defining characteristic of the group. Similarly, while some tetrapods (like certain species of gecko) may have four eyes, this is not a universal trait. Finally, while many tetrapods have four digits on their limbs (or adaptations like hooves or flippers), this is not a requirement either - some tetrapod species have reduced or modified limbs with fewer or more than four digits.

A Tetrapod Is Defined as an Animal with