What are the characteristics of lizards?
Lizards have long bodies and long, clearly defined tails. Their limbs are usually paired and attached to their
bodies at right angles. This enables the animal to lift its body up off the ground when moving. The limbs of
most lizards are weak, and some lizards have very short, stump-like limbs.
The skin of lizards has a horny surface layer, which is formed by a hard, continuous covering of scales.
These scales lie beneath the outer layer of the epidermis so the body can grow. As the animal grows, this outer
layer is shed, allowing for further growth.
Some lizard species do not have eyelids. Lizards have teeth that are fused to the jawbones. Two species
have teeth connected to poison glands.
The tongues of lizards vary considerably. Some have short, fleshy tongues, which have very little movement,
whereas others may have long, slender, and forked tongues.
The lungs of most lizards are the same size, but in some lizards and some snake-like lizards, the left lung
is reduced in size, and the right lung is very long and lies between other internal organs. Lizards have threechambered
hearts.
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