Tetrapods
by Owen N.
At the node tetrapods, all animals evolved four limbs. Before Tetrapods, most animals lived in the water. The adaptation of four limbs allowed movement onto land as well as much faster means of locomotion - running, swimming faster, swinging from trees, and even flying were now accessible. Some animals that share this trait are the salamander, hylochoerus meinertzhageni, and archaeopteryx.
Last updated April 11, 2007.