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In certain snakes there is a large actively functional right and a sma — Snakes

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"In certain snakes there is a large actively functional right and a small comparatively useless left lung. The evolutionist would suggest as the meaning of this that the ancestors of snakes possessed, like normal air-breathing s, a pair of lungs—right and left—approximately equal in size, but that in correlation with the lengthening of the body as it assumed the typical snake form the left lung had undergone a gradual reduction in size. He would point out that in some snakes, such as the , a still further stage has been reached in which the left lung has disappeared altogether, leaving only a single—the originally right—lung."
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Snakes
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Snakes are elongated limbless reptiles of the suborder Serpentes. Cladistically squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales much like other members of the group. Many species of snakes have skulls with several more joints than their lizard ancestors and relatives, enabling them to swallow prey much larger than their heads. To accommodate their narrow bodies