Snake , in Zoology
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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...are arranged linearly rather than side by side, and only one lung is developed, except in members of the boa family, which have two lungs. The jaws of snakes are loosely jointed and extremely flexible...the water snakes, the green, or grass, snakes, the black snakes , the racers , the king snakes (including the milk...