One of the most remarkable anatomical differences among vertebrate bodies is the relative size of their neck, trunk and tail. This can be illustrated by comparing the bodies of a typical snake and of a long tailed lizard. They are both very long and superficially similar. However, most of the snake’s body is a trunk full with organs of the digestive, excretory and reproductive systems, whereas the largest part of the lizard’s body is a muscular tail. Leer más.