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www.answers.com/Q/Do_snakes_have_lungs

YES. Snakes do not have a diaphragm like people do, so they circulate air in and out of the lungs by narrowing the rib cage to push air out and then widening it again to create a vacuum to suck ...

www.reptilesmagazine.com/Kid-Corner/Beyond-Beginners/Snake-Anatomy...

Unlike what mammals have, the reptile glottis is always closed, forming a vertical slit, unless the snake takes a breath. A small piece of cartilage just inside the glottis vibrates when the snake forcefully expels air from its lungs. This produces a snake’s characteristic hiss.

animals.howstuffworks.com/snakes/snake1.htm

Snakes do not have a diaphragm like people do, so they circulate air in and out of the lungs by narrowing the rib cage to push air out and then widening it again to create a vacuum to suck air in. After each breathing cycle, snakes experience apnea-- a stop in breathing

en.wikipedia.org/wiki/Snake

Certain birds, mammals, and other snakes (such as kingsnakes) that prey on venomous snakes have developed resistance and even immunity to certain venoms.: 243 Venomous snakes include three families of snakes, and do not constitute a formal classification group used in taxonomy.

answers.yahoo.com/question/index?qid=20080607072100AAjMeQ7

Yes, they do. How else would you expect a snake to breathe? Most snakes only have one functioning lung though, and the other is greatly reduced or absent because of the shape of a snake's body.

en.wikivet.net/Snake_Respiratory_System

Some species of snakes have a unique saccular diverticulum of open tracheal rings that acts for hissing or as a tracheal lung for gas exchange when gastric contents preclude normal pulmonary function. Lungs. The lung morphology of snakes is very species-dependent but is obviously elongated.

www.cuteness.com/article/kind-respiratory-system-do-reptiles

What Kind of Respiratory System Do Reptiles Have? ... Sea snakes, for example, can take in nearly half of the air they need through their skin (5). ... Indian flapshell turtles have a muscular sheet around their lungs that can expand and contract to allow for respiration. Like snakes, some turtles, including the green sea turtle, must hold ...

animalquestions.org/reptiles/snakes/do-snakes-breathe

Although snakes have 2 lungs, one of them (the left one) is much smaller and often does not function at all. This smaller lung is considered to be a vestigial organ, and some snakes are missing it completely.

sites.google.com/.../human-and-snake-respiratory-system

Snakes generally only have one(the right), however some species have 2 or 4 lungs, a semi-developed lung (the left) and a pair of primordial tracheal lungs (located beside the throat). Another lung difference is that snakes have 2 separate lung chambers in the right lung.

www.kidzone.ws/lw/snakes/facts-seasnake.htm

Sea snakes do not have gills but lungs instead and need to go to the surface for air. Sea Kraits are one of the few sea snakes that go to land to lay their eggs while most others, like the Olive sea snake will give birth in the water.