Lizards typically have limbs and external ears, while snakes lack both these characteristics. However, because they are
defined negatively as excluding snakes, lizards have no unique distinguishing characteristic as a group. Lizards and snakes
share a movable quadrate bone, distinguishing them from the sphenodonts, which have a more primitive and solid diapsid skull.
Many lizards can detach their tails to escape from predators, an act called autotomy, but this ability is not shared by all lizards.
Vision, including color vision, is particularly well developed in most lizards, and most communicate with body language or bright
colors on their bodies as well as with pheromones.
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